I have a feeling that you don't actually have a video repository plugin there, but you are trying to upload videos into the repository folder of Moodle.
What you should be doing is enabling the File system repository (https://docs.moodle.org/31/en/File_system_repository)
Then upload your files to the `moodledata` folder.
moodledata\respository\videos
If you can, always plan to test in a test environment rather than a live server.