$ git submodule update fatal: reference is not a tree: ba81b5bf9ffce6b6ec9c50605035ca9dddb50023 Unable to checkout 'ba81b5bf9ffce6b6ec9c50605035ca9dddb50023' in submodule path 'Src/ThermalController'
The cause of this issue is:
I create the orignal project and add the submodule from remote repo.
Then modified the .gitmodule manual to point a local cache of the remote repo.
Then commit the original project.
I cloned the original project from repo as cloned project.
Here is the working flow:
Update from original project and commit, actually, that is committed to the remote repo.
In cloned project, pull and update the submodule, then I got the error message as above.
That because the local repo is not synced with remote yet.
So the solution is:
1. Try to sync the local/remote repo OR
2. Update the orignal project's submodule to point to the local repo as well as cloned project.