I also have similar problem.
In my case, Twitter Kit shows below error, when the Twitter App is not installed and the kit tries to use webview.
If the twitter app is installed, everything is fine
kit version is 1.8.0.
Invalid json: <?xml version="1.0" encoding="UTF-8"?>
<hash>
<error>Desktop applications only support the oauth_callback value 'oob'</error>
<request>/oauth/request_token</request>
</hash>
Failed to get request token
com.twitter.sdk.android.core.TwitterApiException: 401 Authorization Required
at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:383)
at retrofit.RestAdapter$RestHandler.access$100(RestAdapter.java:220)
at retrofit.RestAdapter$RestHandler$2.obtainResponse(RestAdapter.java:278)
at retrofit.CallbackRunnable.run(CallbackRunnable.java:42)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at retrofit.Platform$Android$2$1.run(Platform.java:142)
at java.lang.Thread.run(Thread.java:818)
Authorization completed with an error
com.twitter.sdk.android.core.TwitterAuthException: Failed to get request token
at com.twitter.sdk.android.core.identity.OAuthController$1.failure(OAuthController.java:95)
at com.twitter.sdk.android.core.internal.oauth.OAuth1aService$1.failure(OAuth1aService.java:215)
at com.twitter.sdk.android.core.Callback.failure(Callback.java:45)
at retrofit.CallbackRunnable$2.run(CallbackRunnable.java:53)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Failed to get request token
com.twitter.sdk.android.core.TwitterAuthException: Failed to get request token
at com.twitter.sdk.android.core.identity.OAuthController$1.failure(OAuthController.java:95)
at com.twitter.sdk.android.core.internal.oauth.OAuth1aService$1.failure(OAuth1aService.java:215)
at com.twitter.sdk.android.core.Callback.failure(Callback.java:45)
at retrofit.CallbackRunnable$2.run(CallbackRunnable.java:53)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
oh, I’m using LoginButton, and the device is Nexus 5 running Android 6.0
