Internal Trace Failure: Empty Destination Key

Internal Trace Failure: Empty Destination Key

  
Hello,

Can anybody shed some light on what might be causing this error? This is the message from Service Studio:

Internal Error
Internal trace failure: Empty Destination Key!.

Exception Details:
[1] Internal Error: Internal trace failure: Empty Destination Key!.
at System.Diagnostics.TraceInternal.Fail(String, String)
at System.Diagnostics.TraceInternal.Assert(Boolean, String)
at System.Diagnostics.Trace.Assert(Boolean, String)
at OutSystems.HubEdition.Compiler.Web.WebButtonWidgetBase..ctor(XmlElement, CompObj)
at OutSystems.HubEdition.Compiler.Web.WebSubmitButtonWidget..ctor(XmlElement, CompObj)
at OutSystems.HubEdition.Compiler.Widget.NewWebWidget(XmlElement, CompObj)
at OutSystems.HubEdition.Compiler.Web.WebScreenNode.NewWidget(XmlElement, CompObj)
at OutSystems.HubEdition.Compiler.ScreenFlowNode..ctor(XmlElement, CompObj)
at OutSystems.HubEdition.Compiler.Web.WebScreenNode..ctor(XmlElement, CompObj)
at OutSystems.HubEdition.Compiler.ScreenFlowNode.NewScreenFlowNode(XmlElement, CompObj)
at OutSystems.HubEdition.Compiler.Web.WebFlow..ctor(XmlElement, CompObj)
at OutSystems.HubEdition.Compiler.Web.WebHandler..ctor(XmlElement, CompObj)
at OutSystems.HubEdition.Compiler.Espace..ctor(XmlDocument, CompObj, Int32, String, TypeMapper)
at OutSystems.HubEdition.Compiler.Compiler.MainExec()
at OutSystems.HubEdition.Compiler.Compiler.Main(String[])

Many thanks.
Never mind; it seems to have fixed itself. Which is nice.