今天运行了好几个有关C#的代码，都是出现这个问题，这块是不是优化了

c:\Users\kouba\AppData\Local\Temp\CSSCRIPT\dynamic\1848.dba6c3bf-31e6-4a64-b7e2-31c64a69b21c.tmp(5,7): warning CS0105: “System”的 using 指令以前在此命名空间中出现过 c:\Users\kouba\AppData\Local\Temp\CSSCRIPT\dynamic\1848.dba6c3bf-31e6-4a64-b7e2-31c64a69b21c.tmp(22,12): error CS0433: 类型“System.IO.Directory”同时存在于“c:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscorlib.dll”和“d:\SoftWare\ShadowBot\dotnet.win-x64\shared\Microsoft.NETCore.App\6.0.24\System.Private.CoreLib.dll”中 c:\Users\kouba\AppData\Local\Temp\CSSCRIPT\dynamic\1848.dba6c3bf-31e6-4a64-b7e2-31c64a69b21c.tmp(28,31): error CS0433: 类型“System.IO.Directory”同时存在于“c:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscorlib.dll”和“d:\SoftWare\ShadowBot\dotnet.win-x64\shared\Microsoft.NETCore.App\6.0.24\System.Private.CoreLib.dll”中 c:\Users\kouba\AppData\Local\Temp\CSSCRIPT\dynamic\1848.dba6c3bf-31e6-4a64-b7e2-31c64a69b21c.tmp(39,20): error CS0433: 类型“System.IO.IOException”同时存在于“c:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscorlib.dll”和“d:\SoftWare\ShadowBot\dotnet.win-x64\shared\Microsoft.NETCore.App\6.0.24\System.Private.CoreLib.dll”中 (