OOT import module error

Hello everyone

I have been trying to create OOT modules following this guide
https://wiki.gnuradio.org/index.php?title=Creating_Python_OOT_with_gr-modtool

but when i try to run de custom module, i get this error:
Traceback (most recent call last):
  File "/home/uno/GNURADIO EJEMPLOS/testOOT.py", line 36, in <module>
    import customModule
ModuleNotFoundError: No module named 'customModule'

Any help you can give me would be appreciated.

i'm working on GNU-RADIO 3.8.10 by the way