Engraving Lines - an error occurred

[Krikor]

Engraving Lines - an error occurred ...

I believe the problem is not the plugin, I always used it and it always worked well.
But since yesterday I can't use it anymore. I downloaded and installed it again, assuming the file might have become corrupted in some way, but it didn't help.
   

Code:

Traceback (most recent call last):
 File "C:\Users\...\Gimp-2.10.21_Portable-32-64bit-Win\lib\gimp\2.0\python/gimpfu.py", line 740, in response
   dialog.res = run_script(params)
 File "C:\Users\...\Gimp-2.10.21_Portable-32-64bit-Win\lib\gimp\2.0\python/gimpfu.py", line 361, in run_script
   return apply(function, params)
 File "C:\Users\...\ofn-engraving.py", line 227, in engravingThickness
   runForRenderer(image,source,renderer,gamma,blur,merge,capStyle,joinStyle,miterLimit)
 File "C:\Users\...\ofn-engraving.py", line 219, in runForRenderer
   traceback.print_exc()
 File "C:/Users/.../lib/python2.7/traceback.py", line 233, in print_exc
   print_exception(etype, value, tb, limit, file)
 File "C:/Users/.../lib/python2.7/traceback.py", line 124, in print_exception
   _print(file, 'Traceback (most recent call last):')
 File "C:/Users/.../lib/python2.7/traceback.py", line 13, in _print
   file.write(str+terminator)
IOError: [Errno 0] Error

Please, what could be causing this plugin to malfunction?

Thank you very much in advance.