At the point when you interface Commerce Sync to your QuickBooks program, it may appear an error message saying Can't Open QuickBooks. This happens when QuickBooks already has a company file open in 2018 or 2019 version. To open another QuickBooks company file, one has to close the file that is opened already.
If you are constantly facing an error message: QuickBooks already has a company file open in 2019 or 2018 version then you can follow our guide to find out the best repair method.
Method 1: Restart Your PC
Method 2: Stop QuickBooks Process using the Task Manager
Method 3: Remove QuickBooks Point of Sale
Method 4: Disable QuickBooks from Startup
Method 5: Open QuickBooks as an Administrator
Method 6: Rename ND and TLG Files
Method 7: Move the QuickBooks Company File to a Different Location