Nvarier Stokes example does not work on the Raspberry Pi

Hi Guys

Please refer to the below link regarding a transient analysis of a CFD problem.
I have copied and pasted the code directly from the website and thus the code is correct.

When running the problem on the Raspberry Pi I get the errors in the attached image. however, I managed to get one of the local distributors of Mathematica to run the same code and it runs on the laptop/PC version of Mathematica. What is the reason for this? Has anyone encountered something similar?