I would like to create my own custom field variables (in this example - nodal U values in all 3 translational directions), and then view contour plot. The following python snippet does create the step, frame and dump given nodal outputs properly (which could be verified by accessing back the odb database), but unable to do the contour plot - says 'Primary variable is not available'. 

The attachment contains - python code and the test analysis inp file. 

Appreciate any help, thanks! 

Abaqus ​​​​​​​