Are you worried about the QuickBooks error 6000 83? The 6000 83 QuickBooks error is a problem that many businesses encounter when they try to use QuickBooks. The errors in QuickBooks can be caused by many factors, but it is recommended to restart your computer and check for any hardware issues before looking into it further. This error is usually caused by one of these two things, either the QuickBooks files on which the company depends have corrupted, giving no way to access employees' information (this may be because of a power failure, or someone deleting data) or the files are in use by another application and QuickBooks cannot access it.