Error: Tensor must have a shape comprised of positive integers but got shape [100,]

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Describe the problem or feature request

I am using tensorflow.js of coco-SSD for mobilenet v2 when I am using the pre-trained model [coco-ssd] it's working perfectly fine, see the below code

const tfnode = require('@tensorflow/tfjs-node');
const cocoSsd = require('./coco-ssd.js'); 
const fs = require('fs');
const readImage = path => {
    const imageBuffer = fs.readFileSync(path);
    const tfimage = tfnode.node.decodeImage(imageBuffer);
    return tfimage;
  }
  const objectDetection = async path => {
    const image = readImage(path);
    const loadlModelPromise = await cocoSsd.load({base: "mobilenet_v2"})
    const result = await loadlModelPromise.detect(image);
    console.log('Classification Results:', result);
  }
  objectDetection(process.argv[2]);

while calling the above code node filename.js ./testImage.png it gives the desired result.

Now I have a custom trained coco-ssd model which i have converted to tensorflow.js format using the below command **tensorflowjs_converter --input_format=tf_saved_model --output_node_names='num_detections,detection_boxes,detection_scores,detection_classes' --signature_name=serving_default --saved_model_tags=serve ./saved_model ./ ** once i have the converted model.json i wrote the below code for inference on the custom converted model.

const tfnode = require('@tensorflow/tfjs-node');
const cocoSsd = require('./coco-ssd.js'); 
const fs = require('fs');
const readImage = path => {
    const imageBuffer = fs.readFileSync(path);
    const tfimage = tfnode.node.decodeImage(imageBuffer);
    return tfimage;
  }
  const objectDetection = async path => {
    const image = readImage(path);
    const modelUrl = 'file:///Users/xx/model.json'
    const loadlModelPromise = await cocoSsd.load({base: "mobilenet_v2",modelUrl: modelUrl})
    const result = await loadlModelPromise.detect(image);
    console.log('Classification Results:', result);
  }
  objectDetection(process.argv[2]);

now when I am running the above code node fileName.js ./testImage.png getting the bellow error

(node:32504) UnhandledPromiseRejectionWarning: Error: Tensor must have a shape comprised of positive integers but got shape [100,]. at assert (C:\Users\xx\tfJs\node_modules@tensorflow\tfjs-core\dist\util.js:105:15) at C:\Users\xx\tfJs\node_modules@tensorflow\tfjs-core\dist\util.js:646:9 at Array.forEach () at Object.assertNonNegativeIntegerDimensions (C:\Users\xx\tfJs\node_modules@tensorflow\tfjs-core\dist\util.js:645:11) at makeTensor (C:\Users\xx\tfJs\node_modules@tensorflow\tfjs-core\dist\ops\tensor_ops.js:73:16) at Object.tensor2d (C:\Users\xx\tfJs\node_modules@tensorflow\tfjs-core\dist\ops\tensor_ops.js:189:12) at C:\Users\xx\tfJs\tensorflowJs Classifier\coco-ssd.js:17:7039 at C:\Users\xx\tfJs\node_modules@tensorflow\tfjs-core\dist\engine.js:388:22 at Engine.scopedRun (C:\Users\xx\tfJs\node_modules@tensorflow\tfjs-core\dist\engine.js:398:23) at Engine.tidy (C:\Users\xx\tfJs\node_modules@tensorflow\tfjs-core\dist\engine.js:387:21)

please help :-)