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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.

Fix VBA ‘Invalid use of Null’ errors with database-linked sheets. NULL detection, type-safe coercion, and the IsNull guard pattern.

Fix VBA ‘Ambiguous Name Detected’ compile errors. Duplicate procedure names, module scoping, and the renaming strategy for project organization.