Modules

Submodules

Init

Create .gitmodules file manually and you could initialize that file using this command

git submodule init

Cloning the internal submodules defined in git modules file by using the following command

git submodule update

Updated submodules

You need to get updated submodules in git
So you can explicitly run

git fetch origin

git status

Then checkout develop branch.

git checkout develop

Reference

SO

Git docs