How to prevent batch window from closing when error occurs?

You could put this line at the beginning of the batch file:

if not defined in_subprocess (cmd /k set in_subprocess=y ^& %0 %*) & exit )

What this line does is, the first time you run it, it re-launches itself in a subprocess that doesn't exit after it finishes running the batch file.

You need to pass the /K switch to CMD, or just open a Command Window and run the batch from the command line.