Element Problem

I think every time you delete a broken element it shows that message

no worries you just ignore it

You may have to make sure that the full java file deleted. Just navigate to your mcreator file/forge/src/main/java/mod/mcreator

folder then find and delete the mods that show up here but not in mcreator gui or visa versa. 

Just recompile it once more by pressing gear button in top bar of MCreator and the error should be gone.