Solved errors

Direct solutions to common programming errors and system issues.

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golang go error compile import
5 min readBeginner

Go "imported and not used": Fix the Golang Unused Import Compile Error

Fix the Go error "imported and not used": delete the import, use the package, add _ for side effects, fix alias mistakes, or run goimports -w main.go.

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.

python error TypeError subscriptable NoneType
4 min readBeginner

Fix Python 'TypeError: X object is not subscriptable' (2026)

Fix Python TypeError 'NoneType' object is not subscriptable. Covers what subscriptable means, NoneType from None-returning functions, int/float errors, and isinstance checks.

linux networking rfkill wifi error
5 min readBeginner

Fix "RTNETLINK answers: Operation not possible due to RF-kill" in Linux

Fix "RTNETLINK answers: Operation not possible due to RF-kill" on Linux. Covers rfkill list, rfkill unblock, hardware switch, and NetworkManager solutions.

SAP error ABAP configuration MM
8 min readIntermediate

SAP Error Message 00058: Entry Does Not Exist — All Scenarios and Fixes

Fix SAP Message 00058 'Entry does not exist in table'. Covers all scenarios: T005E, SKB1, T685, T007A, SECCODE, ABAP ALV. Step-by-step solutions for each table.