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.
High school cafeteria
Set some matrix elements to zero
04 - Scalar Equations 2
04 - Scalar Equations 1
03 - Matrix Variables 1
03 - Matrix Variables 2
02 - Vector Variables 4
06 - Matrix Equations 3
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