使用unity创建项目，进行动画制作

1. 创建unity项目

error:

error CS0006: Metadata file 'Library/PackageCache/com.unity.collab-proxy@2.8.2/Lib/Editor/PlasticSCM/log4netPlastic.dll' could not be found

error CS0006: Metadata file 'Library/PackageCache/com.unity.collab-proxy@2.8.2/Lib/Editor/PlasticSCM/Unity.Plastic.Antlr3.Runtime.dll' could not be found

error CS0006: Metadata file 'Library/PackageCache/com.unity.collab-proxy@2.8.2/Lib/Editor/PlasticSCM/Unity.Plastic.Newtonsoft.Json.dll' could not be found