Lab:merging branches

i tried to complete this as show, but its giving errors, I have also relaunched the lab but again same error.
can you please guide me with this, where i went wrong.

HI Afshan,
you have this message because you did some modification on your repo and you did not yet commit.

git add . 
git commit -m "Commit message" 

then merge

if you don’t want to commit the change just checkout it

git checkout <path-to-file>