Untracked files in sunmodule

[Mahmoud]

Hello

i have problem that i have one branch(calc branch) with submodules and i have merged this branch with Release Branch and the project goes on but later i decided to switch back to that branch(calc branch) the source tree doesn't allow me to do that saying there is untracked file even i'm sure i have committed everything but i noticed the .gitmodules file is different in both Branch what should i do to solve this problem and able to switch to the other branch.