Problem with Penningtrap playground

[BlackCat07]

When trying to run the penningtrap_playground.py I get the following:

Traceback (most recent call last):
File ".../pySDC-2.1/playgrounds/Boris/penningtrap_playground.py", line 89, in
main()
File ".../pySDC-2.1/playgrounds/Boris/penningtrap_playground.py", line 72, in main
uend, stats = controller.run(u0=uinit, t0=t0, Tend=Tend)
File ".../pySDC-2.1/pySDC/implementations/controller_classes/allinclusive_classic_nonMPI.py", line 80, in run
self.hooks.pre_run(step=S, level_number=0)
File ".../pySDC-2.1/playgrounds/Boris/penningtrap_HookClass.py", line 46, in pre_run
N = L.prob.nparts
AttributeError: 'penningtrap' object has no attribute 'nparts'

[pancetta]

Odd.. but I can reproduce this. I'm on it!