Error: predict() must take an object where the keys are the named inputs of the model:

[hmhwe]

I have been trying to run a keras model in browser using keras.js. But whenever i try to predict I got the following error

Error: predict() must take an object where the keys are the named inputs of the model:
Here is js code

handlePredict()
  {
    const model = new KerasJS.Model({
    filepaths: {
    model: 'model.json',
    weights: 'model_weights.buf',
    metadata: 'model_metadata.json'
  },

  gpu : true,
  filesystem : true

})

  model.ready().then(() =>{
    const inputData = {
      'input_1': new Float32Array(samples)
    }
    alert('Converted text = ' + inputData['input_1'])
    return model.predict(inputData['input_1'])
  })
  .then(output =>
    {
    alert('Predicted value : ' + output['fc1000']);
    })
  .catch(err =>
    {
    alert(err);
    })

  }

I am using keras-js 0.3.0 and keras 2.2.4 . Any help would be appreciated.