Emoncms Sync screen does not show location, feednames and download screen

I have downloaded and installed Emoncms on Ubuntu 18.04.lte.
All functions seem to work correct except for the Sync menu. In this menu I only see the Host, Username & Password line. If I fill in the information in this screen, nothing happens. I do not see the Location, Feedname and download button.
If I enter in the terminal: ~/sync$ sudo php sync_run.php, then I see:
[sudo] wachtwoord voor gerard:
SYNC: Starting
SYNC: Home dir: /home/gerard
SYNC: Connected to Redis

I’ḿ not sure what other checks I can do, to find a solution to Sync running.
I hope that someone can give me some hints to guide me further.
Kind regards,