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[tlaplus] Beginner Question: Working with the Prisoners Example

Hi,

I'm attempting to run the Prisoners example on the TLA+ Toolbox to understand how to use TLA+ and TLC. I've copied the Prisoners spec verbatim from here: https://github.com/tlaplus/Examples/blob/master/specifications/Prisoners/Prisoners.tla

I then modified the constants in the model as follows:

Capture.PNG





















When running the model I get the following NullPointerException error with no error trace:




Capture2.PNG
How would I go about debugging this? I've tried different values for the constants (integers, strings) and still get a similar issue. Is anyone able to reproduce this?
Thanks,Hans   

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