unity 调用API demo ,编辑完c#文件后报错,而且无法运行

Microsoft (R) Visual C# Compiler version 2.9.1.65535 (9d34608e)
Copyright (C) Microsoft Corporation. All rights reserved.

error CS2015: ‘D:\Agora-Unity-Quickstart-master\API-Example-Unity\Assets\API-Example\video-sample\HelloVideoAgora.cs’ is a binary file instead of a text file

看报错是文件权限的问题,参考文档来跑通demo,链接https://shimowendang.com/docs/XhxkyDvyk9QrgxGP/read