I have my project + RestKit submodule. Error appeared when I changed RestKit settings. I added support armv6 and armv7 architecture. 

git add .
git add -u 
git commit -m "new"
# On branch master
# Changes not staged for commit:
#   (use "git add <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
#   (commit or discard the untracked or modified content in submodules)
#
#   modified:   RestKit (modified content)
#

How to fix this error.

UPDATE: I don't run git add RestKit.

UPDATE2: The strusture of my project is:

enter image description here

I added submodule as 

git submodule update -i
git git-submodules
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