This happens when Web Connector can’t find the file it needs to work. This file is QWCLog.txt.

What you can do:

To fix this, go to that QWCLog.txt file and correct its permissions. Here’s how.

1. Open File Explorer in Windows.

2. To find the QWCLog.txt file, go to this folder: C:\Users\Public\AppData\local\IntuitQuickBooks Web Connector\version directory

3. Find the QWCLog.txt file, then make sure it’s not write-protected.

4. Open Web Connector to make sure the error is fixed.

Note: If you still get this error, reach out to Intuit Support.

Reference: https://quickbooks.intuit.com/learn-support/en-us/set-up-payments/fix-common-web-connector-errors/00/203305