java.lang.NoClassDefFoundError: retrofit2.Retrofit$Builder

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java.lang.NoClassDefFoundError: retrofit2.Retrofit$Builder
at com.twitter.sdk.android.core.internal.oauth.OAuthService.(OAuthService.java:69)
at com.twitter.sdk.android.core.internal.oauth.OAuth2Service.(OAuth2Service.java:59)
at com.twitter.sdk.android.core.TwitterCore.createGuestSessionProvider(TwitterCore.java:223)
at com.twitter.sdk.android.core.TwitterCore.getGuestSessionProvider(TwitterCore.java:216)
at com.twitter.sdk.android.tweetui.TweetUi.onPreExecute(TweetUi.java:77)
at io.fabric.sdk.android.InitializationTask.onPreExecute(InitializationTask.java:44)
at io.fabric.sdk.android.services.concurrency.AsyncTask.executeOnExecutor(AsyncTask.java:611)
at io.fabric.sdk.android.services.concurrency.PriorityAsyncTask.executeOnExecutor(PriorityAsyncTask.java:43)
at io.fabric.sdk.android.Kit.initialize(Kit.java:69)
at io.fabric.sdk.android.Fabric.initializeKits(Fabric.java:439)
at io.fabric.sdk.android.Fabric.init(Fabric.java:383)
at io.fabric.sdk.android.Fabric.setFabric(Fabric.java:341)
at io.fabric.sdk.android.Fabric.with(Fabric.java:312)
at com.lmst.runnincity.Model.SkobblerAddOn.onCreate(SkobblerAddOn.java:39)
at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1007)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4446)
at android.app.ActivityThread.access$1500(ActivityThread.java:143)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1302)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5124)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)

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