Sigh! There should really be some quality control on Cody, to save us from stupid problems like this...
The third element of aVec in the the image contained within your problem description does not match the third element of aVec used in the test suite.
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Sum the numbers on the main diagonal
03 - Matrix Variables 4
Test Problem; Create a 5x5 array containing all ones
02 - Vector Variables 3
03 - Matrix Variables 3
02 - Vector Variables 1
07 - Common functions and indexing 3
03 - Matrix Variables 2
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