crash on getAllRooms

log

```
java.lang.RuntimeException:

at android.os.AsyncTask$3.done (AsyncTask.java:354)

at java.util.concurrent.FutureTask.finishCompletion (FutureTask.java:383)

at java.util.concurrent.FutureTask.setException (FutureTask.java:252)

at java.util.concurrent.FutureTask.run (FutureTask.java:271)

at android.os.AsyncTask$SerialExecutor$1.run (AsyncTask.java:245)

at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1167)

at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:641)

at java.lang.Thread.run (Thread.java:764)
Caused by: java.lang.IllegalStateException:

at android.arch.persistence.room.RoomOpenHelper.checkIdentity (RoomOpenHelper.java:135)

at android.arch.persistence.room.RoomOpenHelper.onOpen (RoomOpenHelper.java:115)

at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.onOpen (FrameworkSQLiteOpenHelper.java:151)

at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked (SQLiteOpenHelper.java:409)

at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase (SQLiteOpenHelper.java:298)

at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.getWritableSupportDatabase (FrameworkSQLiteOpenHelper.java:96)

at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper.getWritableDatabase (FrameworkSQLiteOpenHelper.java:54)

at android.arch.persistence.room.RoomDatabase.query (RoomDatabase.java:233)

at com.codingblocks.chatter.models.RoomsDao_Impl.getAllRooms (RoomsDao_Impl.java:142)

at com.codingblocks.chatter.fragments.RoomsFragment$2.doInBackground (RoomsFragment.java:129)

at com.codingblocks.chatter.fragments.RoomsFragment$2.doInBackground (RoomsFragment.java:122)

at android.os.AsyncTask$2.call (AsyncTask.java:333)

at java.util.concurrent.FutureTask.run (FutureTask.java:266)
```