Are you a QuickBooks user worried about the error 6000 83? QuickBooks error 6000 can be caused by internal issues. It can occur when QuickBooks is unable to access data on its own. This could be due to a file mismatch, corrupted or lost files, or a corrupt database file. If you are getting this error, try reinstalling the software and running a backup immediately. There are also external reasons which might cause this error, like an issue with the PC or an occurrence of a power outage, Slow internet connection, network connectivity problems or slow network, System update failure, etc.