def METHOD_NAME(self, app_vertex):
    super().METHOD_NAME(app_vertex)
    if not isinstance(app_vertex, DelayExtensionVertex):
        raise PacmanConfigurationException(
            f"The vertex {app_vertex} cannot be supported by the "
            "SplitterDelayVertexSlice as the only vertex supported by "
            "this splitter is a DelayExtensionVertex. Please use the "
            "correct splitter for your vertex and try again.")