Unknown error while trying to spawn actor

[ShaharShakiUnreal]

Hi I'm trying to spawn an object I imported into Carla. I followed this guide:
https://carla.readthedocs.io/en/latest/tuto_A_add_props/#ingestion-in-a-build-from-source
And indeed the object is exposed in blueprint_library. But when I try to spawn it I get the following error:
'Unknown error while trying to spawn actor'
Does anyone know why this is happening?

This is my code:

the blue arrow is where I get the exception.

Needless to say, I have no problem spawning the other objects.

Thanks.

[xavisolesoft]

Could you share the error message and indicate what version of CARLA are you using, please?