The type 'Microsoft.SqlServer.Management.Sdk.Sfc.ISfcHasConnection' is defined in an assembly that is not referenced. You must add a reference to assembly 'Microsoft.SqlServer.Management.Sdk.Sfc, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91'.

 I think the error is fairly explanatory, include a reference to Microsoft.SqlServer.Management.Sdk.Sfc. You have not listed that you added that reference. Sometimes when you add references that use other dll reference's that were not included, then you have to include those other references...even if you are not using them.