when i try to launch fear nightfall modpack and click to enable the vr features of the mod it shows up this error(look screenshot) also im not in any steam vr beta i have tried clean reinstallation of minecraft the only problem is when i try to play in vr mode

that means you need to move the game directory out of the user folder.
steamvr doesn't like special characters in the path. I probably should make that error more descriptive

fixed with 983d868
the error now includes a line of how to fix it