This message comes up when I am integrating Web TimeSheet with Quick Books.
There could be scenarios where I would have to uninstall and reinstall Web TimeSheet Integraton Manager for QuickBooks and may get this error. Check the "Close application.PNG" file attached to the solution.
You might have closed QuickBooks but the "qbw32.exe" process is still running in the background. 
Terminate the "qbw32.exe" process and that should help you in uninstalling the Web TimeSheet Integration Manager for QuickBooks
qbw32.exe is a process belonging to Intuit QuickBooks. "This program is a non-essential process, but should not be terminated when you are using QuickBooks.
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