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An internal QuickBooks error occurred while trying to access the QuickBooks company data file
Sign into QuickBooks as admin
Problem
You cannot sync with QuickBooks Desktop
Description
The web connector shows authentication failed and the web connector is red. Here is the error:
An internal QuickBooks error occurred while trying to access the QuickBooks company data file
Solution
Single User Mode
Log into your QuickBooks company file. Select single user mode. Sign in as admin. Run your web connector.