I Download Project for learning purpose. But in this project i got error that is display in MY Screen Shot . i know that Prefix headers are compiled and stored in a cache, and then automatically included in every file during compilation. This can speed up compilation, and lets you include a file without adding an import statement to every file using it. They are not required, and actually slow compilation whenever you change them.
Screenshot

My Question is that is it possible in my case to add .pch file or not ??? if possible then please explain it.
Thanks in Advance.
The screenshot shows that you do not have the pch file added to the physical folder or it is removed somehow from there even though it is added to the project. You need to add that file again and build to remove this error. You can remove the reference from project before doing that and add it as a new file to this project once you have added it in your physical folder.
A red file name in project as shown in screenshot normally represents a missing file from the project folder structure.