Invalid type MarcTron.Plugin.Services.RewardService when updating to Xamarin.Google.iOS.MobileAds 8.13.0

[jthun]

Describe the bug
Hi! I love the plugin! But when updating Xamarin.Google.iOS.MobileAds to 8.13.0 from 7.66.0, it crashes when launching the iOS app in a simulator, and on a real device it does not compile.

Simulator Launch:

System.TypeLoadException: Invalid type MarcTron.Plugin.Services.RewardService for instance field MarcTron.Plugin.MTAdmobImplementation:rewardService
  at System.Lazy`1[T].PublicationOnlyViaFactory (System.LazyHelper initializer) [0x00011] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corefx/src/Common/src/CoreLib/System/Lazy.cs:382 
  at System.Lazy`1[T].CreateValue () [0x00059] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corefx/src/Common/src/CoreLib/System/Lazy.cs:419 
  at System.Lazy`1[T].get_Value () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corefx/src/Common/src/CoreLib/System/Lazy.cs:509 
  at MarcTron.Plugin.CrossMTAdmob.get_Current () [0x00000] in <a1f1d80e99184596a232d1ec3a284d13>:0 
  at MyApp.iOS.AppDelegate.FinishedLaunching (UIKit.UIApplication app, Foundation.NSDictionary opti
ons) [0x00044] in C:\Users\myusername\source\repos\MyAppName\MyApp\MyApp.iOS\AppDelegate.cs:118 
  at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, System.Type principalClass, System.Type delegateClass) [0x0003b] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:83 
  at MyApp.iOS.Application.Main (System.String[] args) [0x00001] in C:\Users\myusername\source\repos\MyAppName\MyApp\MyApp.iOS\Main.cs:27
2022-03-10 10:32:25.085471+0100 MyApp.iOS[33601:3899831] Unhandled managed exception: Invalid type MarcTron.Plugin.Services.RewardService for instance field MarcTron.Plugin.MTAdmobImplementation:rewardService (System.TypeLoadException)
  at System.Lazy`1[T].PublicationOnlyViaFactory (System.LazyHelper initializer) [0x00011] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corefx/src/Common/src/CoreLib/System/Lazy.cs:382 
  at System.Lazy`1[T].CreateValue () [0x00059] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corefx/src/Common/src/CoreLib/System/Lazy.cs:419 
  at System.Lazy`1[T].get_Value () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corefx/src/Common/src/CoreLib/System/Lazy.cs:509 
  at MarcTron.Plugin.CrossMTAdmob.get_Current () [0x00000] in <a1f1d80e99184596a232d1ec3a284d13>:0 
  at MyApp.iOS.AppDelegate.FinishedLaunching (UIKit.UIApplication app, Foundation.NSDiction
ary options) [0x00044] in C:\Users\myusername\source\repos\MyAppName\MyApp\MyApp.iOS\AppDelegate.cs:118 
  at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, System.Type principalClass, System.Type delegateClass) [0x0003b] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:83 
  at MyApp.iOS.Application.Main (System.String[] args) [0x00001] in C:\Users\myusername\source\repos\MyAppName\MyApp\MyApp.iOS\Main.cs:27

It happens in AppDelegate.cs at
CrossMTAdmob.Current.AdsId = "ca-app-pub-<theid>";

Device Compile:

1>  AOT Compilation exited with code 1, command:
1>  MONO_PATH='/Users/myusername/Library/Caches/Xamarin/mtbs/builds/MyApp.iOS/ef58f5b1f5864c4b0356f5feb837a5ef392411dd92471ed788c20782a7e22379/obj/iPhone/Debug DEV/mtouch-cache/3-Build' /Library/Frameworks/Xamarin.iOS.framework/Versions/15.6.0.3/bin/arm64-darwin-mono-sgen --debug -O=gsharedvt -O=-float32 "--aot=mtriple=arm64-ios,data-outfile=/Users/myusername/Library/Caches/Xamarin/mtbs/builds/MyApp.iOS/ef58f5b1f5864c4b0356f5feb837a5ef392411dd92471ed788c20782a7e22379/obj/iPhone/Debug DEV/mtouch-cache/arm64/Plugin.MtAdmob.aotdata.arm64,static,asmonly,direct-icalls,interp,full,soft-debug,dwarfdebug,no-direct-calls,outfile=/Users/myusername/Library/Caches/Xamarin/mtbs/builds/MyApp.iOS/ef58f5b1f5864c4b0356f5feb837a5ef392411dd92471ed788c20782a7e22379/obj/iPhone/Debug DEV/mtouch-cache/arm64/Plugin.MtAdmob.dll.s" "/Users/myusername/Library/Caches/Xamarin/mtbs/builds/MyApp.iOS/ef58f5b1f5864c4b0356f5feb837a5ef392411dd92471ed788c20782a7e22379/obj/iPhone/Debug DEV/mtouch-cache/3-Build/Plugin.MtAdmob.dll"
1>  Mono Ahead of Time compiler - compiling assembly /Users/myusername/Library/Caches/Xamarin/mtbs/builds/MyApp.iOS/ef58f5b1f5864c4b0356f5feb837a5ef392411dd92471ed788c20782a7e22379/obj/iPhone/Debug DEV/mtouch-cache/3-Build/Plugin.MtAdmob.dll
1>  AOTID 4633FCE3-F48D-4764-BBEF-6E521660CCEA
1>  Failed to load method 0x600004f from '/Users/myusername/Library/Caches/Xamarin/mtbs/builds/MyApp.iOS/ef58f5b1f5864c4b0356f5feb837a5ef392411dd92471ed788c20782a7e22379/obj/iPhone/Debug DEV/mtouch-cache/3-Build/Plugin.MtAdmob.dll' due to Could not resolve type with token 01000023 from typeref (expected class 'Google.MobileAds.RewardBasedVideoAdDelegate' in assembly 'Google.MobileAds, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null') assembly:Google.MobileAds, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null type:Google.MobileAds.RewardBasedVideoAdDelegate member:(null).
1>  Run with MONO_LOG_LEVEL=debug for more information.
1>  AOT of image /Users/myusername/Library/Caches/Xamarin/mtbs/builds/MyApp.iOS/ef58f5b1f5864c4b0356f5feb837a5ef392411dd92471ed788c20782a7e22379/obj/iPhone/Debug DEV/mtouch-cache/3-Build/Plugin.MtAdmob.dll failed.
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(255,3): error MT3001: Could not AOT the assembly '/Users/myusername/Library/Caches/Xamarin/mtbs/builds/MyApp.iOS/ef58f5b1f5864c4b0356f5feb837a5ef392411dd92471ed788c20782a7e22379/obj/iPhone/Debug DEV/mtouch-cache/3-Build/Plugin.MtAdmob.dll'

To Reproduce
Steps to reproduce the behavior:

1. Update Xamarin.Google.iOS.MobileAds to 8.13.0 from 7.66.0
2. Launch the iOS app in a simulator or try to compile with a real iOS device.

Expected behavior
No crash, as when using Xamarin.Google.iOS.MobileAds 7.66.0.

Smartphone (please complete the following information):

• Devices: iPhone 13 Simulator with iOS 15.2 and real iPhone 12 Pro with iOS 15.3.1

Additional context
Xamarin Forms 5.0.0.2337
VS 2022 17.1.1

[marcojak]

Hi,
I'm currently updating the plugin to support Xamarin.Google.iOS.MobileAd 9.13.0.

It seems that there are few incompatibilities so I'll have to fix them and I'll release a new version soon.
Meanwhile I'd suggest you to stay with version 7.66.

Cheers,
Marco

[jthun]

Awesome, looking forward to the new update! Many thanks!

[mxstudios]

Maybe you could update the readme to say this until you get it updated to work with 8.3.0 +. Took a little while of debugging before I can here and found this. Anyone using the plug in after 8.12 was released will be having issues.

Thanks! Hoping this will work out for my app.