Can't build to android

When trying to build to android i get this error, and I've been sitting with this for a lot of hours now but can't figure it out.

Any ideas?

java.io.IOException: Can't read [C:\Users\Gullebulle\.gradle\caches\transforms-2\files-2.1\61f3b99406cc323f0226be9bc77a28cd\googlemobileads-unity-runtime.jar(;;;;;;;**.class)] (Can't process class [com/google/unity/ads/AdNetworkExtras.class] (Unsupported version number [55.0] (maximum 54.0, Java 10)))

 

@VenatusGullebulle

I guess you will find the answer here

https://forum.unity.com/threads/build-error-on-android-app-bundle.1322166/