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Resolve VBA ‘Invalid procedure call’ errors in string operations. Negative/zero indexes, out-of-range positions, and the Mid/Left/Right safe-call patterns.

Fix VBA ‘Library not found’ errors. The References dialog, GUID-based lookup, manual COM library registration, and the early-vs-late binding tradeoff.

Fix VBA ‘User-defined type not defined’ compile errors. Reference dependencies, late binding migration, and the missing-library detection pattern.

Fix Excel LET function ‘name not defined’ errors. Variable name scope, forward reference issues, and the correct order of variable declarations.

Resolve Google Apps Script ‘Service Spreadsheets failed’ errors. Rate limiting, batched operations, and the SpreadsheetApp.flush() timing trick.

Fix VBA ‘Subscript out of range’ errors in arrays. Bounds-checking, dynamic array sizing, and the LBound/UBound safety pattern.

Fix Excel ‘Digital signature is invalid’ errors. Certificate expiration, the re-sign procedure, and Trust Center signature settings.

Fix Excel AND/OR functions returning unexpected TRUE. Operator precedence, short-circuit evaluation, and the parenthesization rules for complex conditions.

Resolve Excel VBA Automation Errors when controlling Outlook. Object lifetime, security prompts, the late-binding fix, and Outlook security prompt suppression.

Fix VBA ‘Cannot access file’ errors during SaveAs operations. Path validation, lock detection, and the safe-save procedure preserving original files.