Parallel Processes execution error

[gianlucaguarini]

Hello folks, I am not a python expert but I decided to make a sublime plugin to run more than on builder process at same time. The plugin works pretty well but I would know if it could be possible to fix the error that I got in the console anytime I run in parallel more than one build script:
Traceback (most recent call last):
File ".\sublime_plugin.py", line 337, in run_
File ".\exec.py", line 103, in run
File ".\exec.py", line 62, in kill
File ".\subprocess.py", line 949, in terminate
WindowsError: [Error 5]

The plugin could be downloaded from here https://github.com/GianlucaGuarini/Subl ... builder.py

Is it possible to set a callback anytime a builder script is completed?

Example [preferred code]:
self.window.run_command("exec", currTask, callback)

thank you for your help