Module "sim_shell" not found

[loopy5418]

When i open the program and click any of the options from the menu, it closes the program and outputs this:

mim/mim_live.py
Traceback (most recent call last):
  File "/home/loopy5418/simLAB/mim/mim_live.py", line 9, in <module>
    from sim import sim_router
  File "/home/loopy5418/simLAB/mim/../sim/sim_router.py", line 14, in <module>
    import sim_shell
ModuleNotFoundError: No module named 'sim_shell'

I've looked everywhere but i cannot find this module. Any help would be greatly appreciated.