Change parameters in legacy tracker

I’m using opencv version 4.5.3 which support legacy trackers.
I’m trying to change parameters in the same way that I did with the regular tracker (older opencv version),picture attached.
but when I use the legacy tracker:
tracker = cv2.legacy.TrackerCSRT_create(param_handler)
I get the error:
SystemError: returned NULL without setting an error

I would really appreciate your help,

please never post images of code anywhere …

and no idea why, but there is only a create() function without any arguments for this in python (same problem for all legacy trackers, btw !)