# In Unity, encountering JsonSerializationException while using ChatGPT API

**URL:** <https://community.openai.com/t/in-unity-encountering-jsonserializationexception-while-using-chatgpt-api/538828>\
**Category:** API\
**Tags:** chatgpt, plugin-development, api\
**Created:** [December 2, 2023, 10:43am UTC](https://community.openai.com/t/in-unity-encountering-jsonserializationexception-while-using-chatgpt-api/538828 "2023-12-02T10:43:00Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![AlexOng](https://sea2.discourse-cdn.com/openai1/user_avatar/community.openai.com/alexong/32/265699_2.png) [@AlexOng](https://community.openai.com/u/AlexOng)\
**Post date:** [December 3, 2023, 12:47am UTC](https://community.openai.com/t/in-unity-encountering-jsonserializationexception-while-using-chatgpt-api/538828/5 "2023-12-03T00:47:30Z")

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I also face the same issues just now and I also follow the tutorial on YouTube(Sarge). I am also curious and do not know the solution for it before.

 ![Error](https://us1.discourse-cdn.com/openai1/original/4X/1/8/1/18151bb51f221936a8982bcef237409aeba0624c.png)

Now I finally found a solution. Try these step, maybe is OpenAI update ther API recently

1. Packages → OpenAIUnity → Runtime → DataTypes
2. Find CreateChatCompletion Response struct
3. Add public string SystemFingerprint {get;set]

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