I found this:
“Go to the file in your project Assets/GooglePlayGames/PluginVersion.cs, inside change the PlayServicesVersionConstraint to “10.2.1” (the default value is"10+”)."
And Unity say Resolution Complete!
Same error too …
Unable to find dependency com.google.android.gms:play-services-ads-lite:[10.2.4] in paths ($SDK\extras\android\m2repository, $SDK\extras\google\m2repository, $SDK\extras\android\m2repository, $SDK\extras\google\m2repository).
I was also having this error, I believe, when I was using 5.6.0b. I ended up switching to Unity Ads, only to realize there is not near enough variety of ads to garner many clicks. I would like to see this issue resolve, and don’t know where to start…the call for the ad simply didn’t work. The error message was similiar but I cannot confirm how similar. I’m only chiming in in case it is a bug that many of us are experiencing…