Duplicate symbols for architecture x86_64 under Xcode
75 duplicate symbols for architecture x86_64
Solve this error try to following
Means that you have loaded same functions twice. As the issue disappear after removing -ObjC from Other Linker Flags, this means that this option result that functions loads twice.
Remove all files that are load twice. and again add that files. make sure there is no any file for adding twice.