This QuickBooks Error Code (-6000, -77) +1(844)233-3033 generally takes place when a user tries to open the QuickBooks company file. There are miscellaneous reasons why this error code appears in the software as listed here: When QuickBooks company files are located in an external drive. QuickBooks is not running with Admin. Due to corrupted or damaged .ND and .TLG files. For needing in-depth & comprehensive guidance on troubleshooting this error bug, you can directly connect to our experts by dialing +1(844)233-3033.