Servicebus DLL in a plugin and ILMerge

System.TypeLoadException: Inheritance security rules violated while overriding member: 'Microsoft.ServiceBus.AuthorizationFailedException.GetObjectData(System.Runtime.Serialization.SerializationInfo, System.Runtime.Serialization.StreamingContext)'. Security accessibility of the overriding method must match the security accessibility of the method being overriden.
at System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes)
at System.Reflection.RuntimeAssembly.GetExportedTypes()
at Microsoft.Xrm.Sdk.KnownProxyTypesProvider.LoadKnownTypes(Assembly assembly)
at Microsoft.Xrm.Sdk.KnownProxyTypesProvider.RegisterAssembly(Assembly assembly)
at Microsoft.Xrm.Sdk.AssemblyBasedKnownProxyTypesProvider.GetNameForType(Type type)
at Microsoft.Xrm.Sdk.Client.OrganizationServiceContext.CheckEntitySubclass(Type entityType)
at Microsoft.Xrm.Sdk.Client.OrganizationServiceContext.CreateQuery[TEntity]()
at Xrm.ServiceContext.get_ContactSet()
at Co_op.Registry.Integration.Plugin.Steps.PopulatePrimary.Process(Registration registration, reg_registration sourceRecord, ServiceContext service)
at Co_op.Registry.Integration.Plugin.Managers.IntegrationManager.CreateRegistrationIndividual(reg_registration sourceRecord, ServiceContext service)
at Co_op.Registry.Integration.Plugin.IntegrationAction.Execute(IServiceProvider serviceProvider)