关于unity的一个报错

当我打开一个网上下载的项目时报了以下的错，想问问各位这是什么意思

Exception thrown while invoking [OnOpenAssetAttribute] method 'SyntaxTree.VisualStudio.Unity.GeneratedAssetOpener:OpenScript (int,int)' : TypeLoadException: Could not resolve type with token 01000001 (from typeref, class/assembly SyntaxTree.VisualStudio.Unity.Bridge.ScriptAssetOpener, SyntaxTree.VisualStudio.Unity.Bridge, Version=1.9.9.0, Culture=neutral, PublicKeyToken=null)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr) (at E:/unity/Modules/IMGUI/GUIUtility.cs:179)

这种情况报错一般都是可以被清掉的，能清掉的话就不用管。