我尝试在我的应用中实施Firebase Auth，但Play服务解析器无法获取依赖关系。我按照Firebase文档的说法做了一切。
Resolution failed
Failed to fetch the following dependencies:
com.google.firebase:firebase-app-unity:4.2.0@aar
com.google.firebase:firebase-auth-unity:4.2.0@aar
UnityEngine.Debug:LogError(Object)
GooglePlayServices.PlayServicesResolver:LogDelegate(String, LogLevel)
Google.JarResolver.PlayServicesSupport:Log(String, LogLevel, Boolean)
GooglePlayServices.ResolverVer1_1:LogMissingDependenciesError(List`1)
GooglePlayServices.<DoResolutionUnsafe>c__AnonStorey18:<>m__28(List`1)
GooglePlayServices.<GradleResolution>c__AnonStorey14:<>m__20(Result)
GooglePlayServices.<GradleResolution>c__AnonStorey15:<>m__2B()
GooglePlayServices.PlayServicesResolver:PumpUpdateQueue()
UnityEditor.EditorApplication:Internal_CallUpdateFunctions()