Pixie self hosted - Error 500 when trying to execute scripts

[Shaul Hamoi]

Hi,

I just installed Pixie self hosted cloud + Pixie's Vizier. (both are in the same cluster)
I see the cluster registered in the UI but when I'm trying to run script , I get an error 500.

https://work.pixie-cloud.example.com/px.api.vizierpb.VizierService/ExecuteScript
application/grpc-web-text
method:
POST

What can be the reason for that error ? do you have any trouble shooting doc ?
I see that in the instruction you ask to expose two services:

Ensure that the cloud-proxy-service and vzconn-service

cloud-proxy-service is the pixie-cloud and work.pixie-cloud.
Where is the use vzconn-service ? I didn't see any instruction to configure it - Does it need explicit config ?