Quickbooks error 6000 is the name of the error that occurs when quickbooks tries to access a local database and can't. This usually only happens if you are trying to use quickbooks on a computer that doesn't have enough memory. If you are having this problem, try turning off your internet connection or moving your files to a different location. Quickbooks error 6000 occurs when you are trying to access your company file. This can happen if the file is corrupted, but it also can occur if someone has locked down your access rights. QuickBooks error 6000 will prevent you from accessing your files unless the issue is resolved.