Web Reference: Oct 15, 2012 · For example: You have a theme folder called AwesomeTheme that's a dedicated repository, you try do dump it directly into your main repository like git submodule add sites/themes and you get this "AwesomeTheme" index already exists. The error "git submodule already exists in the index" occurs when you attempt to add a submodule that has already been initialized or added to the repository; you can resolve this by checking your submodule status or resetting the index. The error message “git submodule already exists in the index” means that the submodule is already tracked by Git. To resolve this error, you can use the `git rm –cached` command to remove the submodule from the index and then add it again.
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