Git: already exists in the index
Git: already exists in the index
Example:
```sh
git submodule add [email protected]:yubaoliu/ROS-Academy-for-Beginners.git
'ROS-Academy-for-Beginners' already exists in the index
```
Solution:
```sh
git rm -r --cached ROS-Academy-for-Beginners
rm 'ROS-Academy-for-Beginners'
```
How to deinit a submoudle:
```sh
git submodule deinit -f ROS-Academy-for-Beginners
```
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