Mcreator file confusion within itself

I am making a modpack and i'm using mcreator to make a core mod and I wanted to change the name of the mod inside of mcreator so I changed the file name using the UI but then every time it tries to open it works but the console says build failed because the name of the mod is still the old one inside all of the files with all the blocks and items i have already created but when I try to change it back only then does the files actually change to the one I had originally changed it to so I have no idea what to do.