for start - showing your code (in python tags) would be helpful. best would be minimal example that reproduce the error (i.e. no GUI part, etc)
If you can't explain it to a six year old, you don't understand it yourself, Albert Einstein
How to Ask Questions The Smart Way: link and another link
Create MCV example
Debug small programs
How to Ask Questions The Smart Way: link and another link
Create MCV example
Debug small programs