Look at the traceback:
Traceback (most recent call last):
File “C:Python33libsite-packagesbottle.py”, line 821, in _cast
out = iter(out)
TypeError: ‘bool’ object is not iterable
Your code isn’t iterating the value, but the code receiving it is.
The solution is: return an iterable. I suggest that you either convert the bool to a string (str(False)) or enclose it in a tuple ((False,)).
Always read the traceback: it’s correct, and it’s helpful.