I want to display base 64 image in MIT App Inventor which is stored in FIRBASE REALTIME DATABASE

com.google.appinventor.components.runtime.errors.YailRuntimeError: Value failed to convert from JSON. at com.google.appinventor.components.runtime.FirebaseDB.DataChanged(FirebaseDB.java:561) at com.google.appinventor.components.runtime.FirebaseDB$1$1.run(FirebaseDB.java:154) at android.os.Handler.handleCallback(Handler.java:959) at android.os.Handler.dispatchMessage(Handler.java:100) at android.os.Looper.loopOnce(Looper.java:301) at android.os.Looper.loop(Looper.java:398) at android.app.ActivityThread.main(ActivityThread.java:9055) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:627) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:970)
Note: You will not see another error reported for 5 seconds.

this error when i try like u guys, help