We'd really want to help you make sure that you're able to get rid of the error message you've encountered in QuickBooks (Geomak).
The error message occurs if QuickBooks is not running, and you need to start or make sure a company file is open and no modal dialog box is open.
To fix this, you'll need to have your end user do the steps according to the instructions in the error message from QuickBooks. And then retry the update operation.
If you still encounter the error, I suggest reaching out to your application’s support for help. For your reference about the steps in fixing Web Connector, please see this article: Fix common Web Connector errors in QuickBooks Desktop.
To learn more on how you can set up and use your QBDT and QuickBooks Time check out this article: Setup and use QuickBooks Desktop for Windows and QuickBooks Time integration.
Feel free to post again here in the Community if you need further assistance in running Web Connector. I'll be always around to help. Keep safe.