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Index of common CLI error messages. grep for your error below.

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AWS

An error occurred (Throttling): Rate exceeded

An error occurred (Throttling) when calling the PutObject operation: Rate exceeded

-> You are making too many requests per second to the AWS API.

An error occurred (AccessDenied)

An error occurred (AccessDenied) when calling the ListBuckets operation: User: arn:aws:iam::123456789012:user/dev is not authorized to perform: s3:ListAllMyBuckets

-> Your AWS credentials are valid, but the IAM user or role does not have permission to perform the requested action.

An error occurred (ExpiredToken)

An error occurred (ExpiredToken) when calling the GetCallerIdentity operation: The security token included in the request is expired

-> Your temporary security credentials (usually from `aws sts get-session-token` or a role assumption) have expired.

An error occurred (ResourceNotFoundException)

An error occurred (ResourceNotFoundException) when calling the GetFunction operation: Requested resource not found

-> The AWS resource you are trying to access (Lambda function, DynamoDB table, etc.) does not exist in the region you are querying.

An error occurred (ValidationError)

An error occurred (ValidationError) when calling the CreateStack operation: Template format error: JSON not well-formed

-> The parameters you sent to the AWS API are invalid (wrong format, missing required fields, etc.).

Ansible

192.168.1.50 | UNREACHABLE! => { "changed": false, "msg": "Failed to connect to the host via ssh: ssh: connect to host ... port 22: Connection refused", "unreachable": true }

-> Ansible could not establish an SSH connection to the target host.

AnsibleUndefinedVariable: '...' is undefined

fatal: [localhost]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'my_var' is undefined"}

-> You are referencing a variable in a template or task that hasn't been set.

Apt

E: Could not get lock /var/lib/dpkg/lock

E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)

-> Another process is currently using the APT package management system (e.g., an automatic update or another terminal window running apt).

E: Unable to locate package

E: Unable to locate package docker-ce

-> APT cannot find the package you requested in its current list of repositories.

E: Hash Sum mismatch

E: Hash Sum mismatch Hashes of expected file: - SHA256:...

-> The downloaded package file is corrupted or doesn't match the metadata (often due to caching proxies or bad mirrors).

Bash

syntax error near unexpected token

bash: syntax error near unexpected token `('

-> Bash encountered a character or keyword in a place it didn't expect.

Bad substitution

bash: ${var//search/replace}: bad substitution

-> You are trying to use a parameter expansion feature that `sh` (or an older bash version) doesn't support.

command not found

bash: foobar: command not found

-> The shell cannot find the executable you are trying to run in your PATH.

Database

psql: error: FATAL: password authentication failed

psql: error: FATAL: password authentication failed for user "postgres"

-> PostgreSQL rejected the connection because the password provided for the user is incorrect or missing.

ERROR 1045 (28000): Access denied for user

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

-> MySQL/MariaDB rejected the login attempt, usually due to an incorrect password or insufficient permissions for the host.

psql: could not connect to server: No such file

psql: error: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/tmp/.s.PGSQL.5432"?

-> The PostgreSQL client cannot find the Unix domain socket file, usually because the server is not running or is configured to use a different socket directory.

Docker

Cannot connect to the Docker daemon

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

-> The Docker client cannot communicate with the Docker daemon (engine).

conflict: unable to delete image

Error response from daemon: conflict: unable to delete 4c108a8 (must be forced) - image is being used by stopped container 8b12345

-> You cannot delete an image because it is still being used (even if just referenced) by a container.

exec format error

standard_init_linux.go:211: exec user process caused "exec format error"

-> The container image's architecture (e.g., ARM64) does not match the host machine's architecture (e.g., AMD64).

manifest for ... not found

Error response from daemon: manifest for node:100-alpine not found: manifest unknown

-> The requested image tag does not exist in the Docker registry.

Error response from daemon: network ... not found

Error response from daemon: network my-app-net not found

-> You are trying to start a container attached to a Docker network that doesn't exist.

docker: open /var/run/docker.sock: permission denied

docker: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.24/containers/create: dial unix /var/run/docker.sock: connect: permission denied

-> Your user does not have permission to talk to the Docker daemon via the Unix socket.

Error response: Container is not running

Error response from daemon: Container 8b12345abcdef is not running

-> You are trying to execute a command (like `exec` or `stop`) on a container that is already stopped or exited.

GPG

gpg: decryption failed: No secret key

gpg: decryption failed: No secret key

-> You are trying to decrypt a message, but you don't possess the private key corresponding to the public key that encrypted it.

Git

fatal: not a git repository

fatal: not a git repository (or any of the parent directories): .git

-> You are running a git command outside of a git repository.

remote: error: hook declined

remote: error: hook declined to update refs/heads/main

-> A pre-receive hook on the server side rejected your push.

error: failed to push some refs

error: failed to push some refs to 'git@github.com:user/repo.git'

-> Your push was rejected because the remote repository has changes that you don't have locally.

fatal: refusing to merge unrelated histories

fatal: refusing to merge unrelated histories

-> Git refuses to merge two projects that don't share a common ancestor.

error: Your local changes would be overwritten by merge

error: Your local changes to the following files would be overwritten by merge: package.json

-> You have uncommitted changes in files that the merge (or pull) needs to update.

fatal: ambiguous argument ... unknown revision

fatal: ambiguous argument 'feature/new-ui': unknown revision or path not in the working tree.

-> Git cannot find the branch, commit hash, or tag you specified.

fatal: The current branch has no upstream branch

fatal: The current branch feature/login has no upstream branch. To push the current branch and set the remote as upstream, use git push --set-upstream origin feature/login

-> You are trying to push a new local branch that doesn't exist on the remote server yet, so Git doesn't know where to push it.

fatal: could not read from remote repository

fatal: could not read from remote repository. Please make sure you have the correct access rights and the repository exists.

-> Git cannot access the remote URL, either because it doesn't exist or you lack permission.

error: pathspec ... did not match any file

error: pathspec 'folder/missing.txt' did not match any file(s) known to git

-> You are trying to operate on a file or branch that Git doesn't know about.

error: checkout: updating paths is incompatible

error: checkout: updating paths is incompatible with switching branches. Did you intend to checkout 'feature/branch' which can not be resolved as commit?

-> You tried to switch branches while also specifying a file path, or the branch name you provided is invalid/ambiguous.

error: RPC failed; curl 56 OpenSSL SSL_read

error: RPC failed; curl 56 OpenSSL SSL_read: Connection was reset, errno 10054

-> The connection to the remote git server was dropped while transferring data, usually due to a large push/pull.

Homebrew

Error: Permission denied @ dir_s_mkdir

Error: Permission denied @ dir_s_mkdir - /usr/local/Frameworks

-> Homebrew lacks the necessary permissions to create a directory in a system path.

Error: No available formula

Error: No available formula with the name "python3.9"

-> Homebrew cannot find the package (formula) you are trying to install.

Kubernetes

ImagePullBackOff

Status: ImagePullBackOff

-> Kubernetes failed to pull the container image and is backing off (waiting) before trying again.

CrashLoopBackOff

Status: CrashLoopBackOff

-> The container is starting but then crashing repeatedly. Kubernetes is waiting between restarts.

Error from server (Forbidden): user cannot list resource

Error from server (Forbidden): pods is forbidden: User "dev-user" cannot list resource "pods" in API group "" in the namespace "default"

-> Your Kubernetes user or service account does not have the RBAC permissions to perform the requested action.

nodes is forbidden: node cannot modify node

nodes "node-1" is forbidden: node "node-1" is not allowed to modify node "node-1"

-> A Kubelet on a node is trying to modify its own Node object but lacks permission (Node Restriction admission plugin).

The connection to the server localhost:8080 was refused

The connection to the server localhost:8080 was refused - did you specify the right host or port?

-> Kubectl is trying to connect to a local cluster (default behavior) but cannot find one, usually because the kubeconfig file is missing or not loaded.

CreateContainerConfigError

Status: CreateContainerConfigError

-> Kubernetes failed to generate the configuration needed to start the container, often due to missing Secrets or ConfigMaps.

Pod status: Pending

Status: Pending

-> The Pod has been accepted by the cluster but cannot be scheduled onto a node.

Linux

No space left on device

cp: error writing 'file': No space left on device

-> The disk partition is full, or the filesystem has run out of inodes.

Too many open files

Error: accept tcp [::]:80: accept4: too many open files

-> The process or the system has reached the limit of open file descriptors.

Permission denied

bash: /usr/local/bin/script: Permission denied

-> You do not have the required permissions (read, write, or execute) for the file or directory.

Bus error (core dumped)

./my-program: Bus error (core dumped)

-> The process tried to access a memory address that the hardware cannot physically address (often alignment issues or non-existent memory).

Segmentation fault (core dumped)

./script: Segmentation fault (core dumped)

-> The process tried to access a memory segment that it doesn't have permission to access (e.g., writing to read-only memory, dereferencing a null pointer).

mkdir: cannot create directory 'folder': File exists

-> You are trying to create a file or directory that already exists.

Read-only file system

touch: cannot touch 'file': Read-only file system

-> The filesystem is mounted as read-only, preventing any modifications.

write error: Broken pipe

-> A process tried to write data to a pipe, but the process on the receiving end had already closed it.

No such file or directory

cat: config.json: No such file or directory

-> The path you specified does not exist.

User is not in the sudoers file

user is not in the sudoers file. This incident will be reported.

-> Your user account does not have administrative privileges granted via the `/etc/sudoers` file.

tar: Error is not recoverable

tar: Error is not recoverable: exiting now

-> The `tar` command encountered a critical error, often due to file corruption or incorrect compression flags.

chmod: Operation not permitted

chmod: changing permissions of '/etc/hosts': Operation not permitted

-> You are trying to change permissions of a file you don't own, or a file on a filesystem that doesn't support permissions (like FAT32/NTFS mount).

find: paths must precede expression

find: paths must precede expression: my_file.txt

-> The syntax of your `find` command is incorrect; specifically, the order of arguments is wrong.

grep: Is a directory

grep: my_folder: Is a directory

-> You asked `grep` to search a directory without telling it to be recursive.

rm: cannot remove directory: Directory not empty

rm: cannot remove 'my_folder': Directory not empty

-> You tried to remove a directory using `rmdir` or `rm` without the recursive flag, but it contains files.

umount: target is busy

umount: /mnt/data: target is busy.

-> You cannot unmount the filesystem because a process is currently using it (has an open file or current working directory there).

Failed to start service: Unit not found

Failed to start nginx.service: Unit nginx.service not found.

-> Systemd cannot find the service file you are trying to manage.

Network

curl: (7) Failed to connect: Connection refused

curl: (7) Failed to connect to localhost port 8080: Connection refused

-> The target host exists but is not listening on the specified port, or a firewall is actively rejecting the connection.

curl: (6) Could not resolve host

curl: (6) Could not resolve host: non-existent-domain.com

-> The DNS resolution failed; the client could not translate the hostname into an IP address.

curl: (35) OpenSSL SSL_connect: SSL_ERROR_SYSCALL

curl: (35) OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to example.com:443

-> The SSL handshake failed abruptly, often due to a firewall blocking the handshake or a proxy issue.

wget: unable to resolve host address

wget: unable to resolve host address 'example.com'

-> Similar to curl's host resolution error, `wget` cannot find the IP address for the given domain.

Nginx

nginx: [emerg] bind() failed: Address already in use

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

-> Nginx cannot start because port 80 (or 443) is already occupied by another process.

Node.js

EADDRINUSE: address already in use

Error: listen EADDRINUSE: address already in use :::3000

-> The port you are trying to bind to is already being used by another process.

FATAL ERROR: JavaScript heap out of memory

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory

-> The Node.js process has exhausted its allocated memory limit (default is around 1.5GB on 64-bit systems).

ReferenceError: ... is not defined

ReferenceError: myVar is not defined

-> You are trying to use a variable that hasn't been declared or is out of scope.

npm ERR! code ERESOLVE

npm ERR! code ERESOLVE npm ERR! ERESOLVE unable to resolve dependency tree

-> NPM cannot find a valid set of versions for your dependencies that satisfies all constraints (peer dependency conflict).

npm ERR! code EACCES

npm ERR! code EACCES npm ERR! syscall access npm ERR! path /usr/lib/node_modules

-> NPM does not have permission to write to the directories it needs to install packages (usually global modules).

npm ERR! 404 Not Found

npm ERR! 404 Not Found - GET https://registry.npmjs.org/non-existent-package - Not found

-> The package or version you are trying to install does not exist in the NPM registry.

Error: Cannot find module

Error: Cannot find module 'express'

-> Node.js cannot find the required file or package.

node:internal/modules/cjs/loader throw err

node:internal/modules/cjs/loader:936 throw err; Error: Cannot find module ...

-> Internal Node.js loader error, usually accompanying a 'Cannot find module' error, but can also indicate corrupted internal state or version mismatch.

npm ERR! cb() never called

npm ERR! cb() never called!

-> An internal logic error occurred within NPM, often due to race conditions or cache corruption.

OpenSSL

openssl: Error: invalid command

openssl: Error: 'cert' is an invalid command.

-> You typed a subcommand that OpenSSL doesn't recognize.

Python

IndentationError: unexpected indent

IndentationError: unexpected indent

-> Python found an indentation level that doesn't match the expectation.

ModuleNotFoundError: No module named

ModuleNotFoundError: No module named 'pandas'

-> Python cannot locate the library you are trying to import.

TypeError: object is not subscriptable

TypeError: 'NoneType' object is not subscriptable

-> You are trying to access an item using square brackets `[]` (like a list or dict) on an object that doesn't support it (like `None`, `int`, or `float`).

ImportError: cannot import name

ImportError: cannot import name 'my_func' from 'my_module'

-> Python found the module but cannot find the specific function or class you are trying to import from it.

ValueError: not enough values to unpack

ValueError: not enough values to unpack (expected 3, got 2)

-> You tried to unpack a sequence (list/tuple) into variables, but the number of items didn't match.

SyntaxError: invalid syntax

SyntaxError: invalid syntax

-> The code violates Python's grammar rules.

KeyError: 'my_key'

-> You tried to access a dictionary key that doesn't exist.

AttributeError: object has no attribute

AttributeError: 'NoneType' object has no attribute 'get'

-> You are trying to access a variable or method that doesn't exist on the object.

RPM

rpm: error: Failed dependencies

rpm: error: Failed dependencies: libc.so.6 is needed by ...

-> You are trying to install a `.rpm` file manually, but it requires other packages that are not installed.

Redis

READONLY You can't write against a read only replica

READONLY You can't write against a read only replica.

-> You are trying to execute a write command (SET, DEL, etc.) on a Redis instance that is configured as a read-only replica (slave).

SSH

Permission denied (publickey)

user@host: Permission denied (publickey).

-> The SSH server rejected your connection because it could not authenticate your public key.

Connection refused (SSH)

ssh: connect to host example.com port 22: Connection refused

-> The SSH client could not establish a TCP connection to the server on port 22.

ssh: connect to host ... port 22: Connection timed out

ssh: connect to host 192.168.1.100 port 22: Connection timed out

-> The SSH client could not reach the server within the allotted time, likely due to networking issues or a firewall dropping packets.

Host key verification failed

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! ... Host key verification failed.

-> The host key stored in your `known_hosts` file doesn't match the key provided by the server.

Received disconnect: Too many authentication failures

Received disconnect from 1.2.3.4 port 22: 2: Too many authentication failures

-> The server disconnected you because your client attempted to authenticate too many times (usually with many different keys from an agent).

sign_and_send_pubkey: signing failed

sign_and_send_pubkey: signing failed: agent refused operation Permission denied (publickey).

-> The SSH agent is running but refused to sign the authentication request, often due to file permission issues or a corrupted agent state.

kex_exchange_identification: Connection reset

kex_exchange_identification: read: Connection reset by peer

-> The SSH connection was established, but the server closed it immediately during the initial handshake (Key Exchange).

ssh: Could not resolve hostname

ssh: Could not resolve hostname my-server: Name or service not known

-> The SSH client cannot translate the hostname you provided into an IP address.

Terraform

Error acquiring the state lock

Error acquiring the state lock Error message: 2 errors occurred: * Resource '...' does not have attribute 'id' * Resource '...' does not have attribute 'type'

-> Another process (or a previous crashed process) is holding a lock on the Terraform state file to prevent corruption.

Failed to query available provider packages

Error: Failed to query available provider packages Could not retrieve the list of available versions for provider hashicorp/aws: no available releases match the given constraints

-> Terraform cannot find a provider version that matches the constraints in your `versions.tf` or `required_providers` block.