title: I am creating a android project which will save username and password of the user, I am getting error while running the app on device
body: <pre><code>06-12 18:20:51.794 17318-17379/zaphlabs.com.knotty E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
      Process: zaphlabs.com.knotty, PID: 17318
      java.lang.RuntimeException: An error occurred while executing doInBackground()
          at android.os.AsyncTask$3.done(AsyncTask.java:309)
          at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
          at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
          at java.util.concurrent.FutureTask.run(FutureTask.java:242)
          at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
          at java.lang.Thread.run(Thread.java:818)
       Caused by: android.database.sqlite.SQLiteException: no such column: username (code 1): , while compiling: SELECT _id, username, password FROM knot
          at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
          at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:887)
          at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:498)
          at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
          at android.database.sqlite.SQLiteProgram.&lt;init&gt;(SQLiteProgram.java:58)
          at android.database.sqlite.SQLiteQuery.&lt;init&gt;(SQLiteQuery.java:37)
          at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
          at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1316)
          at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1163)
          at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1034)
          at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1202)
          at zaphlabs.com.knotty.database.KnotProvider.query(KnotProvider.java:55)
          at android.content.ContentProvider.query(ContentProvider.java:1027)
          at android.content.ContentProvider$Transport.query(ContentProvider.java:238)
          at android.content.ContentResolver.query(ContentResolver.java:502)
          at android.content.CursorLoader.loadInBackground(CursorLoader.java:64)
          at android.content.CursorLoader.loadInBackground(CursorLoader.java:42)
          at `enter code here`android.content.AsyncTaskLoader.onLoadInBackground(AsyncTaskLoader.java:312)
          at android.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:69)
          at android.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:57)
          at android.os.AsyncTask$2.call(AsyncTask.java:295)
          at java.util.concurrent.FutureTask.run(FutureTask.java:237)
  </code></pre>
  
  <p>Please help me in this. I am getting error from a very long time and not able to solve this below is my full code which you may see to help me out.</p>
  
  <p><a href="https://github.com/iammohdzaki/Knotty" rel="nofollow noreferrer">Code is Here</a></p>