}

Articles tagged "error"

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golang go type error type conversion
6 min readIntermediate

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.

golang go error compile variables
5 min readBeginner

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.

golang go error compile main package
6 min readBeginner

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.

golang go error compile import
5 min readBeginner

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.

golang go error nil pointer
6 min readIntermediate

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.

golang go error compile undefined
6 min readBeginner

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.

golang go undefined error compile
6 min readBeginner

Fix Golang 'undefined: function' Error — All Causes (2026)

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

python error AttributeError NoneType debugging
5 min readBeginner

Fix Python AttributeError: 'X' object has no attribute 'Y' (2026)

Fix Python AttributeError 'X' object has no attribute 'Y'. Covers None from functions, typos, missing self.attr in __init__, wrong types, module errors, hasattr and getattr.

python error IndentationError TabError tabs
4 min readBeginner

Fix Python IndentationError and TabError: Tabs vs Spaces (2026)

Fix Python IndentationError unexpected indent and TabError inconsistent use of tabs and spaces. Covers PEP 8, VS Code, vim retab, python -tt, and .editorconfig.

python error ModuleNotFoundError pip import
4 min readBeginner

Fix Python ModuleNotFoundError: No module named 'X' (2026)

Fix Python ModuleNotFoundError: No module named 'X'. Covers pip install, wrong Python version, venv not activated, sys.path debugging, and import name differences.