The script fix_group_names.rb goes wrong in line 40, unfortunately you cropped off the rest of the error message, so we have to guess the nature of the error…
Where is the script from ?
Can you contact the author direct etc…
If it’s your own read the error and edit the file, find the problem line[s] etc…
To see the full error message in the Ruby Console try: load 'fix_group_names.rb'
which ought to report the full error for you…
Your error indicates progressbar.rb is missing. It’s a SU plugin. You also could remove the plugin fix_group_names.rb too as it is not working without progressbar.rb.