NAV 2013 R2 Web client error

Hello,

We have designed a modification in the standard Sales Order page where by pressing an Action on the ribbon the other page opens and it ultimately adds sales lines to the current sales order.

In windows client this functionality works fine but when running the same from web client it bombs out. the error in the browser is

A server error has occurred, and the content cannot be displayed. Refresh the page or open a new browser window.

This is the error which we receive in the event viewer. Also attached the screenshot of the event viewer.

Error accessing Website Microsoft Dynamics NAV 2013 R2 Web Client
URL: http://navserver:8080/DynamicsNAV71/Web ... okeHandler
Type: Microsoft.Dynamics.Framework.UI.FormNotFoundException
Message: The logical form as specified in parameter with name 'LogicalControlReference' could not be found in the current session.
StackTrace:
at Microsoft.Dynamics.Framework.UI.InteractionParameterHelper.GetLogicalControl(UISession uiSession, IDictionary`2 namedParameters)
at Microsoft.Dynamics.Framework.UI.Client.SaveValueInteractionExecutionStrategy.Initialize(IInteractionContext context, IDictionary`2 namedParameters)
at Microsoft.Dynamics.Framework.UI.InteractionManager.<InvokeInteractions>d__a.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Dynamics.Framework.UI.WebBase.WebBaseInteractionManager.<InvokeInteractions>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
at Microsoft.Dynamics.Framework.UI.CultureAwaiter`1.GetResult()
at Microsoft.Dynamics.Framework.UI.Web.WebInteractionManager.<InvokeInteractions>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
at Microsoft.Dynamics.Framework.UI.CultureAwaiter`1.GetResult()
at Microsoft.Dynamics.Framework.UI.Web.CallbackHandler.<HandleRequest>d__3.MoveNext()
Source: Microsoft.Dynamics.Framework.UI


Anybody have the idea what could be the possible cause? I looked into the list of Web client limitations as well as I tried googling but didn't make much progress. Any help will be appreciated.

Thanks