The QuickBooks error code 6000 77 is a company file error that occurs in your system when you have not been granted permission to gain access to any QuickBooks folders or files. In addition, the aforementioned error is one of the most commonly occurring errors in the QuickBooks software. However, it is not supposed to be taken lightly because if ignored it can cause some serious damage to your data. The QuickBooks error code 6000 77 needs to be resolved as soon as possible.