Oh sorry, I was still adding a new post. (Multi-tasking ftw! xD)
Anyway, Idk about the error message... Im not good at reading those things. If it's in the scripts it should automatically jump you there, but at your experience level, I wouldn't recommend you editing anything. As for deleting off the lsit, you can't. The best thing to do in this case it to be the same pokemon multiple times. for example, if on land, maybe at 1% put Pidgey lv 8, and repeat pidgey at lower levels. and do things similar to that. I know it's a pain, but it's all that can be done.