Errror in mode Database and Folder

[thomas2403]

I have installed ownnote in nc 17. I'm using "Database and Folder" and I'm getting errors like this:

"Non-static method OCP\Files\Storage\IStorage::file_exists() cannot be called statically"

That's why I changed all calls with "\OCP\Files\Storage\IStorage::" to "\OC\Files\Filesystem::" and got it working.
Can someone please test this from https://github.com/thomas2403/ownnote and confirm, that it's working? After that I would like to make pull request here.