BUG error

Hello,

I bought my key yesterday and as soon as I tried to make the bot work, this message shows up on log. What should I do? I have already uninstalled and installed again. Please someone help me

[E] 09:38:53 - gdgfdgfd: Compilator Error :
warning CS1685: The predefined type 'System.Runtime.CompilerServices.ExtensionAttribute' is defined in multiple assemblies in the global alias; using definition from 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll'
error CS0012: The type 'System.Attribute' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.