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java.lang.NullPointerException: Attempt to invoke interface method 'void com.couchbase.lite.storage.SQLiteStorageEngine.setTransactionSuccessful()' on a null object reference	at com.couchbase.lite.store.SQLiteStore.endTransaction(SQLiteStore.java:2358)	at com.couchbase.lite.store.SQLiteStore.add(SQLiteStore.java:1607)	at com.couchbase.lite.Database.put(Database.java:1844)	at com.couchbase.lite.Database.putRevision(Database.java:1794)	at com.couchbase.lite.Database.putRevision(Database.java:1785)	at com.couchbase.lite.Document.putProperties(Document.java:523)	at com.couchbase.lite.Document.putProperties(Document.java:350)	at com.example.tristanrichard.coucbasesample.MainActivity.store(MainActivity.java:54)	at com.example.tristanrichard.coucbasesample.MainActivity$ActivityTask.doInBackground(MainActivity.java:91)	at com.example.tristanrichard.coucbasesample.MainActivity$ActivityTask.doInBackground(MainActivity.java:73)	at android.os.AsyncTask$2.call(AsyncTask.java:304)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)