Linker command failed with exit code 1 error in Xcode project

Question

I was working on my project and suddenly after editing the code and compiling gave this error:

ld: warning: directory not found for option \'-
L/Use

Answer 1

the same error i faced. so, i just removed reference of that classes which are generating the errors and than again gave reference and the error was gone...

as D80Buckeye says there should be problem of dragging and dropping files instead of Clicking on "Add Files"