I am getting the correct output ...

I am getting the correct output for each of the test cases; however, when I run the program I get:

AssertionError: First <module>, 22 57

Can someone please explain this error? In my code, line 22 is the first assert statement (assert checkio([120, [10 , 20, 30]]) == 57, 'First')

I've commented out all but one assert line at a time so I could see that I'm getting the correct output for each assert.