Cannot load log at local server (Error 500)

Hello. I try to start local server of Flight Review.
I do it with OK (./ --show)
When I try load sample.ulg I get error:

Error when handling POST data <class ‘FileNotFoundError>’ (Error 500)
No such file or directory: 'home/serg/flight_review/plot_app/../data/log_files/45459a9b-a306-4acb-9572-f005b614d5ac.ulg

I cannot find this path. How can I fix this??

I simply forgot to start DB server