I can't open raven!

When I click on Raven give me NotFound!!

Is this hosted on Frappe Cloud?

If not, can you try running “bench build —app raven” - the frontend app might not have been built. Raven should be running on the path “/raven”.

I host on cloud cluster.
and when I click on Raven it’s take me to this url:https://erp.example.com/raven
and this is not defined!!!

should I use frappe cloud ?

Ideally yes. If you’re self hosting, you need to ensure that the frontend assets of the app are being compiled (that’s the bench build command)

I did bench build but still not working give me NotFound!!!

Did you see any error when running bench build? Can you paste the output for that here?