Unable to load .mot files

[sina morningstar]

I have an old model that was made with opensim3.3 and when I opened it whit opensim 4.5 it gave me a warning to change some of coordinates from rotational to coupled and I changed them in notepad++ and the warning got fixed. Now I wanted to load the motion files on my model but it gives me an error: "could not associate motion to current model"