QuickBooks event id 4 error happens due to installation issues in the QuickBooks.
Causes:
Company files are corrupted.
Deleted QuickBooks associated file.
You need to do a clean install of QuickBooks, to do so, uninstall QuickBooks and get it installed again.
Get event id 4 error fixed; connect to QBSsolved at +18889101619.
Here are some things you can try to fix the Unexpected QuickBooks Event ID 4 Log Error:
Regards,
Peter