Corruption of files when using pdf to musescore

I am trying to transfer a pdf to the musescore format, mscz, using the website https://musescore.com/import#. When i do this all looks successful until i open the file, there it encounters many errors and is very corrupted. The parts are all in voice and a lot of notes are missing. Is there any way to fix this issue? The pdf im trying to convert is attached.