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java.lang.NullPointerException at at<init>( at at at com.mopub.common.UrlResolutionTask.resolveRedirectLocation( at com.mopub.common.UrlResolutionTask.getRedirectLocation( at com.mopub.common.UrlResolutionTask.doInBackground( at com.mopub.common.UrlResolutionTask.doInBackground( at android.os.AsyncTask$ at at java.util.concurrent.ThreadPoolExecutor.runWorker( at java.util.concurrent.ThreadPoolExecutor$ at