Question: I have a JSON file

```
response ={
  "classifier_id": "xxxxx-xx-1",
  "url": "/testers/xxxxx-xx-1",
  "collection": [
    {
      "text": "How hot will it be today?",
      "top_class": "temperature",
      "classes": [
        {
          "class_name": "temperature",
          "confidence": 0.993
        },
        {
          "class_name": "conditions",
          "confidence": 0.006
        }
      ]
    },
    {
      "text": "Is it hot outside?",
      "top_class": "temperature",
      "classes": [
        {
          "class_name": "temperature",
          "confidence": 1.0
        },
        {
          "class_name": "conditions",
          "confidence": 0.0
        }
      ]
    }
  ]
}

```

Current Output
--------------

[![enter image description here](https://i.stack.imgur.com/svfxp.png)](https://i.stack.imgur.com/svfxp.png)

Code and undesired output
-------------------------

[![enter image description here](https://i.stack.imgur.com/sT1yZ.png)](https://i.stack.imgur.com/sT1yZ.png)

I tried `json_normalize`, however, it's giving duplicates.

How can I convert this Jason file to Pandas DataFrame?

The records for each collection should be expanded wide, not long.

![result: DataFrameImage](https://i.stack.imgur.com/cjlSv.jpg)

Answer: 
Just to people who may end up in the same case as me. The reason of this error was that I was using the `beta` channel. After switching to the `stable` channel, I ran

```
cd ios/
pod deintegrate
pod cache clean --all
cd ..
flutter clean

```

And, I removed the `Podfile` and the `Podfile.lock`. Then, I built the project again and it worked!
You are tying to import a version of `RxSwift` that has already set its minimum deployment target to iOS 12.0 while your project itself is still on iOS 10.0.

This should not be related to Xcode or the Xcode update.

If you can post your Podfile we can verify this.