Cannot add adapters to adapter groups

System.InvalidCastException: Unable to cast object of type 'System.Collections.Generic.List`1[Unify.Product.IdentityBroker.BasicAdapterRemotingConfiguration]' to type 'System.Collections.Generic.IList`1[Unify.Product.IdentityBroker.IBasicAdapterRemotingConfiguration]'.
at Unify.Connect.Web.GroupController.UpdateAdapterGroupAdapters(Guid groupId) in c:\workspaces\IdentityBroker\Source\Studio\Unify.Connect.Web\Controllers\GroupController.cs:line 365
at lambda_method(Closure , ControllerBase , Object[] )
at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass15.<>c__DisplayClass17.<InvokeActionMethodWithFilters>b__14()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)