net.sqlcipher.database.SQLiteException: file is not a database: , while compiling: select count(*) from sqlite_master;

java.lang.RuntimeException: An error occurred while executing doInBackground()
	at android.os.AsyncTask$3.done(AsyncTask.java:353)
	at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
	at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
	at java.util.concurrent.FutureTask.run(FutureTask.java:271)
	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
	at java.lang.Thread.run(Thread.java:764)
     Caused by: net.sqlcipher.database.SQLiteException: file is not a database: , while compiling: select count(*) from sqlite_master;
	at net.sqlcipher.database.SQLiteCompiledSql.native_compile(Native Method)
	at net.sqlcipher.database.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:91)
	at net.sqlcipher.database.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64)
	at net.sqlcipher.database.SQLiteProgram.<init>(SQLiteProgram.java:89)
	at net.sqlcipher.database.SQLiteQuery.<init>(SQLiteQuery.java:48)
	at net.sqlcipher.database.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:60)
	at net.sqlcipher.database.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:2012)
	at net.sqlcipher.database.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1898)
	at net.sqlcipher.database.SQLiteDatabase.keyDatabase(SQLiteDatabase.java:2647)
	at net.sqlcipher.database.SQLiteDatabase.openDatabaseInternal(SQLiteDatabase.java:2577)
	at net.sqlcipher.database.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1243)
	at net.sqlcipher.database.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1318)
	at net.sqlcipher.database.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:166)
	at com.commonsware.cwac.saferoom.Helper$OpenHelper.getWritableSupportDatabase(Helper.java:173)
	at com.commonsware.cwac.saferoom.Helper.getWritableDatabase(Helper.java:83)
	at androidx.room.RoomDatabase.inTransaction(RoomDatabase.java:476)
	at androidx.room.RoomDatabase.assertNotSuspendingTransaction(RoomDatabase.java:281)
	at android.os.AsyncTask$2.call(AsyncTask.java:333)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245) 
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162) 
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636) 
	at java.lang.Thread.run(Thread.java:764)

The user provided an incorrect passphrase, or the database is not encrypted, or the database somehow has been corrupted.

To be clear: the stack trace that you are getting is coming from SQLCipher for Android, the underlying database implementation. SafeRoom is just some temporary bridge code to allow you to work with SQLCipher for Android from Room or other SupportSQLiteDatabase clients.

This error is a very common error, indicating that SQLCipher for Android was unable to decrypt the database using your supplied passphrase. Whether that problem is from a bad passphrase or a bad database cannot be determined.