MCreator issue tracker has been migrated to GitHub.
Existing tickets have been migrated to GitHub. Please open new tickets on the GitHub tracker instead. If you do not have a GitHub account, all feature requests and bug reports from forums are still considered and checked by the maintainers.
Without more context and error logs or descriptions I can't help you.
You might find help on this page: https://mcreator.net/support/knowledgebase