can not compile with U#

[misakayuuki]

Describe the bug in detail:
can not compile with U#

Provide steps/code to reproduce the bug:
just creat a U# script and failed to compile

[UdonSharp] C# scripts have compile errors, prefab upgrade deferred until script errors are resolved.
UnityEngine.Debug:LogWarning (object)
UdonSharp.UdonSharpUtils:LogWarning (object) (at Packages/com.vrchat.udonsharp/Editor/UdonSharpUtils.cs:314)
UdonSharpEditor.UdonSharpEditorManager:UpgradeAssetsIfNeeded () (at Packages/com.vrchat.udonsharp/Editor/UdonSharpEditorManager.cs:795)
UdonSharpEditor.UdonSharpEditorManager:OnEditorUpdate () (at Packages/com.vrchat.udonsharp/Editor/UdonSharpEditorManager.cs:744)
UnityEditor.EditorApplication:Internal_CallUpdateFunctions ()

[jellejurre]

It says "C# scripts have compile errors", this means that your input C# script is not valid C#.

There should be more errors in the console which tell you what is wrong. Fix these errors and the script should compile.