private method set_output' called for #<LiveKit::EgressServiceClient:0x000055f15cca5cf8> .rvm/gems/ruby-2.6.1@immerss-portal/gems/livekit-server-sdk-0.6.1/lib/livekit/egress_service_client.rb:42:in start_room_composite_egress'

I think in this case it must use set_output(request, output) instead self.set_output(request, output) in whole lib/livekit/egress_service_client.rb file