The QuickBooks Error 80029c4a generally occurs when a user attempts to open QuickBooks or a company file. The error can also appear when a file is damaged or corrupted. There are several causes of this error, which is also called a run-time error. This error occurs when users launch QuickBooks. Additionally, this error could also occur if the QuickBooks component fails to start and work or if the Dynamic Link Library (DLL) files are damaged or missing due to system irregularities.