Can't open tablet client

ncmmoussaoui@outlook.com

Hello,

we recently setup a webclient and the universal app. Everything works fine except the tablet client, which runs into the following error when you try to connect with the app or try to resolve the tablet.aspx url:

error accessing website microsoft dynamics nav 2016 web client
URL: https://XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Type: System.InvalidCastException
Message: The object of type "Microsoft.Dynamics.Framework.UI.GroupControl" cannot be converted to object of type "Microsoft.Dynamics.Framework.UI.ActionControl".
StackTrace:
bei Microsoft.Dynamics.Nav.WebClient.Decorators.CueGroupActionDecorator.DoBuild(LogicalForm form, MasterPage pageDefinition, UIBuilderContext context)
bei Microsoft.Dynamics.Nav.Client.FormBuilder.PageBuilder.ExecuteDecorators(LogicalForm form, MasterPage definition, UIBuilderContext context)
bei Microsoft.Dynamics.Nav.Client.FormBuilder.PageBuilder.Build(MasterPage definition, BindingManager bindingManager, UIBuilderContext context)
bei Microsoft.Dynamics.Nav.Client.FormBuilder.BuilderSession.CreateLogicalForm(MasterPage metadata, FormState formState)
bei Microsoft.Dynamics.Nav.Client.FormBuilder.BuilderSession.CreateLogicalForm(Int32 formId, FormState formState, Int32 retryCounter)
bei Microsoft.Dynamics.Nav.Client.FormBuilder.NavigationTreeProvider.ProcessContent(IEnumerable`1 actionBaseDefinitionList, NavigationNode parentNode, UIBuilderContext context)
bei Microsoft.Dynamics.Nav.Client.FormBuilder.NavigationTreeProvider.ProcessNavigationGroups(LogicalControl parent, IEnumerable`1 actionBaseDefinitionList, NavigationNode parentNode, UIBuilderContext context)
bei Microsoft.Dynamics.Nav.Client.FormBuilder.NavigationTreeProvider.ProvideNavigationPane(MasterNavigation definition, UIBuilderContext context)
bei Microsoft.Dynamics.Nav.Client.Web.NavWebBuilderSessionInitializer.NavigationServiceTreeOnLoad(Object sender, Object e)
bei Microsoft.Dynamics.Framework.UI.UX2006.NavigationService.get_NavigationRoot()
bei Microsoft.Dynamics.Nav.Client.NavRunHomepagePropertyBagInvokedAction.Validate(FormPropertyBag queryParameters, UISession uiSession, Object invocationState)
bei Microsoft.Dynamics.Framework.UI.LogicalFormActivator.GeneratePropertyBagCommand(FormPropertyBag propertyBagToUse, UISession uiSession, Object invocationState)
bei Microsoft.Dynamics.Framework.UI.LogicalFormActivator.ValidateAndInvokePropertyBag(FormPropertyBag propertyBagToUse, UISession uiSession, Object invocationState)
bei Microsoft.Dynamics.Framework.UI.Web.WebPropertyBagInvoker.InvokeFormPropertyBag(FormPropertyBag propertyBag)
bei Microsoft.Dynamics.Framework.UI.Web.LogicalFormInitializer.<>c__DisplayClass1.<Create>b__0()
bei Microsoft.Dynamics.Framework.UI.LogicalOperationInvoker.InvokeAndHandleExceptions(Func`1 action, IExceptionHandler exceptionHandler)
Source: Microsoft.Dynamics.Nav.Client.WebClient

Has anybody dealt with this issue before and can help me?