Program starts fine now, but I get this error when trying to calibrate.

Invalid format specifier '!r' for object of type 'str'

Traceback (most recent call last):
  File "/usr/lib64/python3.13/site-packages/wx/core.py", line 3427, in <lambda>
    lambda event: event.callable(*event.args, **event.kw) )
                  ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/DisplayCAL/display_cal.py", line 10292, in start_measureframe_subprocess
    f"sys.path.insert(0, {pydir:!r});"
                         ^^^^^^^^^^
ValueError: Invalid format specifier '!r' for object of type 'str'

Currently have python 3.13.3 installed on my systems.