The error message you are seeing is likely misleading. The actual reason for this error is missing files in your vim installation. Specifically, the error is related to the Tabby plugin for vim. You can check the file tabby.vim in the Tabby plugin's autoload directory to see the specific line causing the error. Additionally, it would be helpful to share the file tree under the plugin's directory, which is usually located at ~/.vim/plugged. This will help identify any missing files or incorrect installation. It's also worth mentioning that installing the lua-nvim package resolved the issue for you.