Unittests.test_tsp_medium_graph fails at grading process

[TMosh]

A search of the Forum for “tsp_medium_graph” turned up several links - including this one:

It is possible that the tsp_medium_graph grader is broken?

So I was getting the errors mentioned in a different topic about suboptimal performance, but now I’m just getting: There was an error grading your submission. Details: 'str' object has no attribute 'args' The test, however, passes for unittests.test_tsp_medium_graph(Graph_Advanced)