Description of Error:
The following error appears when attempting to connect to QuickBooks:
A modal dialog box is showing in the QuickBooks user interface. Your application cannot access QuickBooks until the user dismisses the dialog box.
Cause of Error:
There is a window showing in QuickBooks that must be dismissed before the integration can complete. This will typically be a question of some type of acknowledgment screen (Are you sure you want to delete this transaction? or something similar) or the Product Information window.
Go to QuickBooks on the computer where you received the error and dismiss the modal dialog box. Then attempt to connect again.