Are you a Quickbooks user willing to know about error 6000? QuickBooks Error 6000 is caused by some files in your QuickBooks installation being damaged. Your system may not be able to recognize them and will show an error message when it tries to access them. The problem can be solved by restoring the file and repairing the folder that contains it. The QuickBooks online Support Services can also help you get the issue fixed if you are unable to do so or have difficulty understanding how to do it yourself.