Error: Expected an intended block?

Question

I get error in my code:

https://code.sololearn.com/cLqTx9xc10jc/?ref=app

Answer 1

I've wrote 'pass' right under if-block and it made the same error. I am quite new to programming, so sorry if I won't understand simple concepts.

Answer 2

I found the problem. I missed out line 9. I Also found out that it's a bad calculator. Thanks for replying