SUMMARY:
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.
 
CAUSE:
You might have closed QuickBooks but the "qbw32.exe" process is still running in the background. 
 
 
SOLUTION:
Terminate the "qbw32.exe" process and that should help you in uninstalling the Web TimeSheet Integration Manager for QuickBooks
 
 
MORE INFORMATION:
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.