There are lots of error in else condition.

ISSUE's are for reporting the kata itself as wrong. Since this is about your code, it should be a QUESTION.

I suggest reading the error message that you are getting, since it says where this happens and it says what things are involved, all the information you need is in that error message.

Converting to string using str and concatenating with + is often very unwieldy, after figuring out the bug you might want to check out f string literals or str.format.