When going through this quickbooks sync manager error, the QuickBooks application cannot be accessed. This error is caused primarily by damaged and missing programming documents. In terms of most critical errors, Sync Manager errors take the lead. Among the reasons why this error was made are the following:
Files containing QuickBooks programming are either corrupt or deleted.
During fact transfer, any community issues may arise.
It is also possible for Firewall settings to cause this error.
This also causes QuickBooks Error 3003.
There are several QuickBooks Sync Manager errors and fixes