}

Solved_errors Index Page 1

SOLVED: function main is undeclared in the main package (Go)

Fix Go error "function main is undeclared in the main package". Causes: wrong package name, missing main(), running go run on wrong file, or build tags.

git
gpg

SOLVED: gpg signing failed: inappropriate ioctl for device

Fix "gpg signing failed: inappropriate ioctl for device" when doing git commit. Set GPG_TTY, restart gpg-agent, or use pinentry-mode loopback.

pip

SOLVED: error: pg_config executable not found (psycopg2 pip install)

Fix "error: pg_config executable not found" when pip install psycopg2 fails. Install postgresql-dev headers or use psycopg2-binary instead.

Fix Docker 'Permission Denied' Error (2026) — All Causes

Fix "Got permission denied while trying to connect to the Docker daemon socket" in 2026. All causes: docker group, socket permissions, rootless Docker, sudo workaround.

go

Fix 'cannot use X (type Y) as type Z' in Go — Type Mismatch Guide

Fix 'cannot use X (type Y) as type Z' in Go. Covers explicit conversions, interface satisfaction, pointer vs value receivers, and type assertions with the ok pattern.

go

Fix 'declared and not used' Error in Go (2026)

Fix Go's 'declared and not used' compile error. Learn why Go enforces this, how to use the blank identifier _, and common cases like loop variables and error returns.

go

Fix: "function main is undeclared in the main package" in Go

Fix the Go error "runtime.main_main·f: function main is undeclared in the main package". Covers all 5 causes with code examples and step-by-step solutions.

go

Go error: "imported and not used" — Fix Unused Import Compile Error

Fix the Go compiler error "imported and not used". Learn why Go enforces this rule and the 4 ways to resolve it: remove the import, use it, blank import, or goimports.

go
nil

Fix 'nil pointer dereference' Panic in Go (2026)

Fix Go's 'nil pointer dereference' runtime panic. Covers nil pointers, nil interfaces, nil maps, uninitialized structs, stack trace reading, and nil-safe patterns.

go

Fix 'undefined: functionName' Error in Go (2026)

Fix the Go 'undefined: functionName' compile error. Covers wrong package, unexported names, typos, missing imports, and circular imports with before/after code.