The Blocks you posted are insufficient to provide any specific advice.
Are you using the Map component or the method using OSM without the Map Component using the WebViewer?
Ae you using a design time or run time Marker .
What does your SetLabel Procedure do? I expect the code is failing because your Autostrada_A1 Block. You might share all your Blocks. 
You probably can provide the name with Blocks. How? It depends on how all your Blocks are coded. You do not provide sufficient information to even guess.
This tutorial shows one way to work with a 'label' for the Marker National Park Tutorial (Markers) updated