symbol(s) not found for architecture arm64 in xcode 7.1 - ios

I got this error when trying to running app in simulator. And I'm using this library. https://github.com/donobono/DoImagePickerController. How can I solve this problem?
Undefined symbols for architecture arm64:
"_OBJC_CLASS_$_DoImagePickerController", referenced from:
objc-class-ref in NewActivityVC.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Thank you in advance

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error when running application

i get this answer when I'm trying to run my application both on my iphone and in simulator.
Undefined symbols for architecture arm64:
"_OBJC_CLASS_$_AppDelegate", referenced from:
objc-class-ref in main.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

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Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_", referenced from:
objc-class-ref in AppDelegate.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code
1 (use -v to see invocation)
I've been converted the library from Java into Objective-C. But I can't launch the project .
How to fix this issue?

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