GondorsbaneJr

So im on 1.16.5 i add all the immersive stuff like engineering petroleum portals and posts and i load into my main moddded minecraft world and then later i exit because i have bad fps i delete the mods then i try to load back in and it shows me this message "errors in currently selected datapacks prevented world from loading. you can either try to load only with vanilla datapack (safe mode) or go back to title screen and fix it manually" and ive tried everything but it still gives me that message everytime i try loading the world without immersive mods ad i dont know how to fix it please help