App crash when I submit a new post to Parse

Question

This is the only Place my app crashes and one of the more important features

The LogCat tells me:

java.lang.IllegalArgumentException: You must

Answer 1

In my case I had to remove the '@ParseClassName' annotation in my model class. My understanding is that if I have a parse model class 'Posts' and I call 'registerSubclass(yourclassname)' in Application, then all I need is

Post obj = new Post();

Answer 2

I got this error because I forgot to register my parse class as a subclass in my application extension:

public class App extends Application
{
    @Override
    public void onCreate()
    {
        super.onCreate();

        App application = this;

        ParseObject.registerSubclass(Posts.class); // <-- This is what you need

        Parse.enableLocalDatastore(this);
        Parse.initialize(new Parse.Configuration.Builder(getApplicationContext())
                                 .applicationId(EnvironmentConfig.appID)
                                 .server(EnvironmentConfig.serverName)
                                 .enableLocalDataStore()
                                 .build());

        ParseInstallation.getCurrentInstallation().saveInBackground();
    }
}

Answer 3

Replace this line

ParseObject post = new ParseObject("Posts");

with this

ParseObject post = ParseObject.create("Posts");

Answer 4

You probably made a mistake in initialising Parse in your Application class. Or forgot to put android:name=".YourApplicationClass" in your Manifest file.

Answer 5

Ensure that you've added the below line in the Application.java class where Parse is initialised

ParseObject.registerSubclass(Message.class);