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Attempt to invoke virtual method 'java.lang.String java.lang.String.trim()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.trim()' on a null object reference	at com.example.hp.marklist.admin$1LoginAsync.onPostExecute(admin.java:143)	at com.example.hp.marklist.admin$1LoginAsync.onPostExecute(admin.java:81)	at android.os.AsyncTask.finish(AsyncTask.java:651)