fluentd-ui does not start after fresh compile

[lgwapnitsky]

Fresh compile on Ubuntu 20.04

Here is my output after compiling:

Successfully installed fluentd-ui-1.2.1
Parsing documentation for fluentd-ui-1.2.1
Parsing sources...
100% [12/12]  lib/treeview.rb
Done installing documentation for fluentd-ui after 0 seconds
1 gem installed
root@opensearch:/opt/td-agent# /usr/local/bin/fluentd
fluentd     fluentd-ui  
root@opensearch:/opt/td-agent# /usr/local/bin/fluentd-ui setup
root@opensearch:/opt/td-agent# /usr/local/bin/fluentd-ui start    
root@opensearch:/opt/td-agent# 

Any notions on what I can check to get this started?

[ofloxacin]

same issue

[maulanaakbardj]

same issue