Indentationt error Python (if/else)

I have a problem with my code:

def enum2(q,k):
    n = q.length
    if k == n:
        #asdasdsa
    else:
        for i in range(0,n):
            q[k] = i
            if (isSafe(q,k)):
                enum2(q,k+1)

    else:
   ^
IndentationError: expected an indented block

The Python compiler throws the above error regarding the indentation in the else statement, but I don't know why.

I have looked for spaces but I didn't find any except tabs.