Jitsi meet manual installation

I am trying to install jitsi-meet (self hosting) manually, I installed prosody and nginx and jitsi-videobridge using apt install then I cloned the jicofo and jitsi meet project from github. After setting all configurations and running all services, I am trying to join room from browser but the following error appears in console:
CONFERENCE FAILED: conference.videobridgeNotAvailable

Please help me to solve this problem