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I'm using Twitter4J library for OAuth authentication but I get "Authentication Challenge is Null Exception" even before It opens the Twitter login page. Here is the code. Twitter twitter = new TwitterFactory().getInstance(); try { twitter.setOAuthConsumer(Startup.TWITTER_KEY, Startup.TWITTER_SECRET); String callbackURL = "twitter-client:///"; RequestToken rToken = twitter.getOAuthRequestToken(callbackURL); startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(rToken.getAuthenticationURL()))); } catch(IllegalStateException e) { // access token is already available, or consumer key/secret is not set. if(!twitter.getAuthorization().isEnabled()){ System.out.println("OAuth consumer key/secret is not set."); System.exit(-1); } } catch(Exception e) { Toast.makeText(Home.this, "Network Host not responding: "+e.getMessage(),Toast.LENGTH_SHORT).show(); //This exception. } Exception: E/Home ( 4393): Received authentication challenge is null E/Home ( 4393): Received authentication challenge is nullRelevant discussions can be on the Internet at: E/Home ( 4393): http://www.google.co.jp/search?q=6c607809 or E/Home ( 4393): http://www.google.co.jp/search?q=0f1d8134 E/Home ( 4393): TwitterException{exceptionCode=[6c607809-0f1d8134 cab4c0ac-d492a113], statusCode=-1, retryAfter=0, rateLimitStatus=null, version=2.2.2} E/Home ( 4393): at twitter4j.internal.http.HttpClientImpl.request(HttpClientImpl.java:204) E/Home ( 4393): at twitter4j.internal.http.HttpClientWrapper.request(HttpClientWrapper.java:65) E/Home ( 4393): at twitter4j.internal.http.HttpClientWrapper.post(HttpCl

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