Common Mistakes (aka Gotcha’s)

• General Advice
• My stimulus isn’t appearing, there’s only the grey background
• The loop isn’t using my Excel spreadsheet
• I just want a plain square, but it’s turning into a grating
• The code snippet I’ve entered doesn’t do anything
• My stimulus isn’t changing as I progress through the loop
• I’m getting the error message AttributeError: ‘unicode object has no attribute ‘XXXX’
• The window opens and immediately closes

If you are having problems getting the application to run please see Troubleshooting