Error: Backend name 'undefined' not found in registry

This error shows up at 'console.log('Error tf.setBackend(): ‘, error);’ when I run the below code to run load posenet.
I used to use ‘tf.ready()’ and worked completely fine several weeks ago, but now this error shows up. Please advise how to solve this. Thank you.

Error: Backend name ‘undefined’ not found in registry

Versions are: expo --version 3.11.7 node --version v12.14.1 npm -version 6.13.4 @ tensorflow/tfjs-react-native@0.2.3 @tensorflow-models/posenet@2.2.1 @tensorflow/tfjs@1.7.2

import * as React from 'react';
import * as tf from '@tensorflow/tfjs';
import * as posenet from '@tensorflow-models/posenet';

export default class Notification extends React.Component {
  inputTensorHeight = 200;
  inputTensorWidth = 152;

  async componentDidMount() {

    await tf.setBackend().then( ref => {
      console.log('--------- tf.setBackend');
    }).catch(function(error) {
      console.log('Error tf.setBackend(): ', error);
    });   

    const posenetModel =  await posenet.load({ 
      architecture: 'MobileNetV1',
      outputStride: 16, 
      inputResolution: { width: this.inputTensorWidth, height: this.inputTensorHeight },
      multiplier: 0.75, 
      quantBytes: 2 
    }).then( ref => {
      console.log('--------- posenet loaded.');
    }).catch(function(error) {
      console.log('Error posenet.load: ', error);
    });   
}

[tafsiri]

@sauceishere I think you are going to have to do a bit more digging to get help with debugging this. Without more detailed info about what encironment you are running in and what error is happening we won’t be able to effectively look into this.

If you aren’t seeing any errors from expo/javascript, try looking into the device logs to see what is output by the mobile device before the app shuts down. The react native docs have some more details on how to do this. Note you cannot use tfjs-react-native in a simulator.

[sauceishere]

It solved upon switch from Developer mode to Production mode on Expo. Thanks.