Compilation error in react native - ios

I am trying to build my react native project for release and i am getting the error:
Undefined symbols for architecture armv7:
"_OBJC_CLASS_$_RCTRootView", referenced from:
objc-class-ref in AppDelegate.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
can some one help here please i cant figure it out.

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Not able to build ios app due to Undefined symbol: _OBJC_CLASS_$_GADRewardBasedVideoAd

I have this error which i m not able to solved,
I set build active architecture = Yes
and other linked flags = $(inherited)
Undefined symbols for architecture x86_64:
"OBJC_CLASS$_GADRewardBasedVideoAd", referenced from:
objc-class-ref in RootViewController.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Any way to solve this error

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Undefined symbols for architecture arm64:
"_OBJC_CLASS_$_DoImagePickerController", referenced from:
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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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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)

j2objc error while compile the project x86_64

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?

Vungle SDK problems

I am trying to implement the Vungle Ad network to my app. I followed the documentation here. When I build and run, it fails with this:
Undefined symbols for architecture i386:
"_OBJC_CLASS_$_SKStoreProductViewController", referenced from:
objc-class-ref in libvunglepub.a(UIViewController+VGAppStoreViewController.o)
"_SKStoreProductParameterITunesItemIdentifier", referenced from:
-[UIViewController(VGAppStoreViewController) prepareStoreViewController:] in libvunglepub.a(UIViewController+VGAppStoreViewController.o)
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Any help will be highly appreciated

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