Every time I try to load my world I get the error

"Errors in currently selected data packs prevented the world from

loading

You can either try to load it with only the vanilla data packs ("safe mode").

or go back to the title screen and fix it manually"

I have a lot of mods installed and don't know if its the mods causing the issue.

Please tell me what I need to do

Please post debug.log from the logs folder.
If you using CurseForge you need to enable the debug.log in the settings.