App freezes when invoking Amplify.DataStore.save()

I’m using Kotlin and AWS Amplify to make a simple mobile app. I’ll begin by showing what I have setup. My schema.graphql:

type OfferGQL @model {
   id: ID!
   name: String!
   description: String!
   address: String!
   price: Float!
 }

My AWS plugins are setup like this:

Amplify.addPlugin(AWSCognitoAuthPlugin())
Amplify.addPlugin(AWSS3StoragePlugin())
Amplify.addPlugin(AWSDataStorePlugin())
Amplify.configure(applicationContext)

This is how I try to save my data to the DataStore:

// Create a new offer object
val newOffer = OfferGQL.builder()
    .name(textFieldOfferName.text.toString())
    .description(textFieldOfferDescription.text.toString())
    .address(textFieldOfferAddress.text.toString())
    .price(textFieldOfferPrice.text.toString().toFloat())
    .build()

// Put it in the DataStore 
Amplify.DataStore.save(newOffer,
    { result ->
        runOnUiThread{Toast.makeText(this,"Offer added successfully", Toast.LENGTH_LONG).show()}
    },
    { error ->
        println(error.message)
        println(error.localizedMessage)
        println(error.cause)
        println(error.recoverySuggestion)
    }
)

The problem is that when I invoke Amplify.DataStore.save(...), the entire app freezes. I followed the documentation to configure everything so I don’t really know why this is happening.

(Also asked this on StackOverflow.)

[Zablas]

@jamesonwilliams Yes signing in fixes that. Once again, the fix for the original bug is a complete reinstall of the app so I’m closing this for now. Thanks for the communication!

[jamesonwilliams]

@Zablas Based on the bottom of your stack trace, it looks like you haven’t signed-in any user. It also looks like you’ve configured this API to use Cognito. As a result, the DataStore is not able to sync, since it trying to use Cognito authentication when talking to AppSync.

TLDR: did you complete a successful Amplify.Auth.signIn(...)?