title: How do i solve "Undefined symbols for architecture arm64" error?
body: <p><strong>I used the latest version of the AdMob plugin &amp; unity Mediation plugin.</strong> but I still get this error, How do I solve the &quot;Undefined symbols for architecture arm64&quot; error?. Please help me to solve this error.</p>
  <p>Here is my pod file look like:</p>
  <pre><code>source 'https://github.com/CocoaPods/Specs' source 'https://github.com/CocoaPods/Specs.git' platform :ios, '12.0'
  
  target 'UnityFramework' do   pod 'GoogleMobileAdsMediationUnity', '4.0.1.0'   pod 'Google-Mobile-Ads-SDK', '~&gt; 9.0' end target 'Unity-iPhone' do end use_frameworks!
  </code></pre>
  <p><strong>Errors that got from Xcode:</strong></p>
  <p>Undefined symbols for architecture arm64:
  &quot;_GADAdSizeLeaderboard&quot;, referenced from:
  _supportedAdSizeFromRequestedSize in UnityAdapter(GADMAdapterUnityUtils.o)
  &quot;_NSValueFromGADAdSize&quot;, referenced from:
  _supportedAdSizeFromRequestedSize in UnityAdapter(GADMAdapterUnityUtils.o)
  &quot;_NSStringFromGADAdSize&quot;, referenced from:
  +[NSError(Unity) unsupportedBannerGADAdSize:] in UnityAdapter(NSErrorUnity.o)
  &quot;<em>OBJC_CLASS</em>$_GADMediationAdConfiguration&quot;, referenced from:
  _<em>OBJC</em>$<em>CATEGORY_GADMediationAdConfiguration</em>$_Settings in UnityAdapter(GADMediationConfigurationSettings.o)
  &quot;<em>OBJC_CLASS</em>$_GADMediationServerConfiguration&quot;, referenced from:
  _<em>OBJC</em>$<em>CATEGORY_GADMediationServerConfiguration</em>$_Settings in UnityAdapter(GADMediationConfigurationSettings.o)
  &quot;_GADAdSizeBanner&quot;, referenced from:
  _supportedAdSizeFromRequestedSize in UnityAdapter(GADMAdapterUnityUtils.o)
  &quot;_GADClosestValidSizeForAdSizes&quot;, referenced from:
  _supportedAdSizeFromRequestedSize in UnityAdapter(GADMAdapterUnityUtils.o)
  &quot;_IsGADAdSizeValid&quot;, referenced from:
  -[GADMediationAdapterUnity loadBannerForAdConfiguration:completionHandler:] in UnityAdapter(GADMediationAdapterUnity.o)
  -[GADMAdapterUnity getBannerWithSize:] in UnityAdapter(GADMAdapterUnity.o)
  &quot;<em>OBJC_CLASS</em>$_GADAdReward&quot;, referenced from:
  objc-class-ref in UnityAdapter(GADMUnityRewardedMediationAdapterProxy.o)
  ld: symbol(s) not found for architecture arm64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)</p>
  <p>Error ScreenShot:
  <a href="https://i.stack.imgur.com/FSh3g.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FSh3g.jpg" alt="Error ScreenShot1" /></a></p>
  <p><a href="https://i.stack.imgur.com/ZJJSA.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZJJSA.jpg" alt="screenshot2" /></a></p>