react-native-image-resizer: Cannot read file with React Native FS

Not sure what’s going on here: Here’s a sample app I am working on and am debugging.

'use strict';
import React, { Component } from 'react';
import {
  AppRegistry,
  Dimensions,
  StyleSheet,
  Text,
  TouchableHighlight,
  View
} from 'react-native';
import Camera from 'react-native-camera';

import ImageResizer from 'react-native-image-resizer';

var cv = require('./computervision');
global.Buffer = global.Buffer || require('buffer').Buffer;
import RNFS from 'react-native-fs';

class testcase2 extends Component {
  render() {
    return (
      <View style={styles.container}>
        <Camera
          ref={(cam) => {
            this.camera = cam;
          }}
          style={styles.preview}
          aspect={Camera.constants.Aspect.fill}>
          <Text style={styles.capture} onPress={this.takePicture.bind(this)}>[CAPTURE]</Text>
        </Camera>
      </View>
    );
  }

  takePicture() {
    this.camera.capture()
      .then((data) => {
        console.log(data);
        ImageResizer.createResizedImage(data.path, 736, 500, 'JPEG', 25, 0)
        .then((cv_image) => {
          var img = 'file:///' + (cv_image.replace('file:/', ''));

          setTimeout(() => {

            RNFS.readFile(img, 'UTF8')
            .then((file) => {
              console.log(file);
              file = new Buffer(file);
              console.log("Running CV App");
              cv(file);
            })

          }, 2500);

        })
        .catch((err) => {
          if (err) throw err;
        });
      })
      .catch(err => console.error(err));
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1
  },
  preview: {
    flex: 1,
    justifyContent: 'flex-end',
    alignItems: 'center',
    height: Dimensions.get('window').height,
    width: Dimensions.get('window').width
  },
  capture: {
    flex: 0,
    backgroundColor: '#fff',
    borderRadius: 5,
    color: '#000',
    padding: 10,
    margin: 40
  }
});

AppRegistry.registerComponent('testcase2', () => testcase2);