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android.database.sqlite.SQLiteException: Can't downgrade database from version 19 to 17	at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:181)	at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:137)	at android.content.ContentProviderProxy.query(ContentProviderNative.java:421)	at android.content.ContentResolver.query(ContentResolver.java:478)	at android.content.ContentResolver.query(ContentResolver.java:422)	at android.support.v4.content.CursorLoader.loadInBackground(CursorLoader.java:49)	at android.support.v4.content.CursorLoader.loadInBackground(CursorLoader.java:35)	at android.support.v4.content.AsyncTaskLoader.onLoadInBackground(AsyncTaskLoader.java:242)	at android.support.v4.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:51)	at android.support.v4.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:40)	at android.support.v4.content.ModernAsyncTask$2.call(ModernAsyncTask.java:123)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)	at java.lang.Thread.run(Thread.java:818)