// java.lang.RuntimeException: An error occurred while executing doInBackground()
// at android.os.AsyncTask$3.done(AsyncTask.java:309)
// at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
// at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
// at java.util.concurrent.FutureTask.run(FutureTask.java:242)
// at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
// at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
// at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
// at java.lang.Thread.run(Thread.java:818)
// Caused by: java.lang.StringIndexOutOfBoundsException: length=0; regionStart=0; regionLength=-1
// at java.lang.String.startEndAndLength(String.java:298)
// at java.lang.String.substring(String.java:1087)
// at com.mschlauch.comfortreader.SettingsLoader.loadTextfromFilePath(SettingsLoader.java:621)
// at com.mschlauch.comfortreader.CRPreferenceActivity$MyPreferenceFragment$7$1.doInBackground(CRPreferenceActivity.java:314)
// at com.mschlauch.comfortreader.CRPreferenceActivity$MyPreferenceFragment$7$1.doInBackground(CRPreferenceActivity.java:306)
// at android.os.AsyncTask$2.call(AsyncTask.java:295)
// at java.util.concurrent.FutureTask.run(FutureTask.java:237)
// ... 4 more