How can I change the location of files in xcode project?

Question

I put some files on the same level of *.xcodeproj file carelessly. When I move these files into the right location in Finder， Xcode tells me that these files a

Answer 1

I found the answer.

3 things

1 removed the reference to the red files then dragged them back into the project relinked all my .m and .h files just incase

2 then removed the .app reference and dragged it back in to the project.

3 removed any duplicates or red files in the build phases

Fixed Thanks everyone for your suggestions and help