When I run my program, it has the error stated above. It says it doesn't have any errors (besides the one in the top right corner), but "RuntimeError. Irritants: (The operation + cannot accept the arguments: , [0], [nothing] Bad arguments to +) Note: You will not see another error reported for 5 seconds." pops up. It runs VERY slowly because of this. Also, the gravity on the enemy sprites do not seem to work
Here is the project:
https://gallery.appinventor.mit.edu/?galleryid=ff309b54-142a-4368-85b8-86c100c9477b
Pics of the code:
