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In MCreator 1.8.2 we have added Minecraft Forge version tag as a dependency as many users used MCreator with different versions Minecraft Forge than with the one MCreator used to compile mods. This caused many crashes and errors due to version mismatches. We added this dependency to resolve this issue.
Check this issue for more info and a not recommended workaround: https://mcreator.net/tracker/issue/46740