I am working on project with another developer. We are working on bitbucket.
The problem is he made a changes in XIB files. After that when I do a git pull, I receive the changes but get an error on XIB files. When I tried to open it, a show alert message saying could not opened 
Line 81 startTag: invalid element name.

Thanks :)
Glad you corrected the issue. I recently ran into the same issue. It a merge conflict and that is why Xcode is throwing that error. Within the .xib file you will see something like:
<<<<<<< HEAD  // code  =======  // code  >>>>>>> apps   You can do what you did above, or manually correct the merge conflict issues by opening the .xib file in a text editor. After correcting it the file should open fine in Xcode.
All you have to do is find the <<<<<<< HEAD lines and delete them. Compiled on my first try. For some reason they are inserted into the .xib file when you have a merge conflict.
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