error: package net.mcreator.firstevermod.client.model does not exist help needed

I was getting ready to export my mod and so I changed the mod package name, mod ID/namespace and the mod display name and now when I try to run the mod it gives me a bunch of errors each one is different but they all are the same type of error saying "error: package net.mcreator.firstevermod.client.model does not exist" is the there anyway for me to fix this?