Error code 02 when starting NetZero application

Good day! NetZero is not starting because of an error that saying that it is already running but I am sure that it is not.
The message was (image also attached below):
Problem Starting NetZero
The NetZero software is already running.
You must close the software before restarting it.
Error Code : 02
Any solution to this would be appreciated.
Thank you.

