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No valid host was found when launching an instance Openstack/Devstack

Hi everyone,

Hi everyone, I begin with Openstack and i try to install it with devstack. When i go to my dashboard and i create my instances, I have an error "Host was not found". I check if I have free memory and disk space and it's ok. I dont really understand how i can fix this error ( I'm really beginner with Openstack), anyone can help me please ?

I see this post :

But i dont understand the answer.

Anyone can help me ? , I'm a real beginner with Openstack.

Thank's for your help