Error accessing folder/can not copy OP

Hi,guys.I met a problem when i using Touchdesigner,i can’t copy my OP in Touchdesigner,when i try to copy OP, A pop-up warning appears, (but I can still create new OP components), and I’ve attached the full text of the warning below.
I’m wondering if this has anything to do with the fact that I’ve previously used python’s ffmpeg for video compression and changed the Path of my system’s environment variable for this purpose.
Can I fix this error please? If not, do I need to uninstall/reinstall Touchdesigner?
I would appreciate it if someone could solve my doubts.
screen shoot

Hi guys,i am glad to told if somebody met same problems as me,you should uninstall FFmpeg’s every exe in your computer and delete the three files in the System path (should be ffmpeg.exe, ffplay.exe, ffprobe.exe)
In System Properties/Advanced/Environment Variables remove the value you added to the Path variable, or change it back to its original state.