1.Unable to parse YAML file: [did not find expected key] at line 804

先关闭unity engine,然后删除项目中的所有meta文件,再重新开启unity del /a /f /s /q "*.meta"

2.升级Unity 2017到2021过程中,console出现报错Why do I get the error "Unsafe code may only appear if compiling with /unsafe"?

只需要将指定文件的unsafe模式打开就好了。

3.Assets\Model\XXCustom\System\XXTextOutline.cs(217,9): error CS0034: Operator '+=' is ambiguous on operands of type 'Vector4' and 'Vector2'