Aurion Agent 5.1 not saving

Installed IdB 5.1 RC in a lab with Aurion 5.1 RC. Creating an agent for Aurion lets me fill in the fields, but on saving throws the following error:

System.IO.FileNotFoundException: Could not load file or assembly

'Unify.Framework.Communicator.Certificate, Version=5.2.0.0,

Culture=neutral, PublicKeyToken=84b9288cb2633de4' or one of its

dependencies. The system cannot find the file specified.
File name: 'Unify.Framework.Communicator.Certificate, Version=5.2.0.0, Culture=neutral, PublicKeyToken=84b9288cb2633de4'
at Unify.Connect.Web.AurionAgentController.Serialize(AurionAgentViewInformation viewInformation)
at Unify.Connect.Web.AurionAgentController.CreateOrEdit(AurionAgentViewInformation saveInformation)
at lambda_method(Closure , ControllerBase , Object[] )
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.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__36(IAsyncResult

asyncResult, ActionInvocation innerInvokeState)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult)

at

System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3c()

at

System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass45.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3e()

at

System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass30.<BeginInvokeActionMethodWithFilters>b__2f(IAsyncResult

asyncResult)
at

System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass1e.<>c__DisplayClass28.<BeginInvokeAction>b__19()

at

System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass1e.<BeginInvokeAction>b__1b(IAsyncResult

asyncResult)