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

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 symbol:_OBJC_CLASS_$_RCTModelManager
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Undefined symbols for architecture x86_64

I try to build my project and get this error:
Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_FlurryAnalytics", 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)

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?

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