PEX Programming: Event EditorTypeArtigos.AfterRowing always gives error

I'm working on a PEX interface extensibility project, in the following section: AfterSave .

The code:

Imports Primavera.Extensibility.BusinessEntities.ExtensibilityService.EventArgs
Imports Primavera.Extensibility.Integration.Modules.Base.Editors

Namespace Logistics
    Public Class EditorFichaArtigos
        Inherits Primavera.Extensibility.Base.Editors.FichaArtigos

        Public Overrides Sub DepoisDeGravar(Artigo As String, e As ExtensibilityEventArgs)
            MyBase.DepoisDeGravar(Artigo, e)
            Try
                MsgBox("Codigo Depois de gravar")
            Catch ex As Exception

            End Try
        End Sub


    End Class
End Namespace

As an example I added a message to debug.

The message is displayed, so the event apparently runs successfully. However, at the end ERP returns an error message:

  

'Spring.Extensibility.BusinessEntities.ExtensibilityService.EventArgs.ExtensibilityEventArgs'   does not contain a definition for 'ImplementationErrors'

What will it take to schedule this message not to occur?