Error opening Feeds details

when I click on the eye on the right of the feed, to open the detail, i got this error:

URI not acceptable. No controller ‘graph’. (40/)

It happen for all feeds.
I have on premise version of emoncms, installed on Debian Virtual Machine, version 9.7.2 | 2016.07.04

Someone can help me?

Many Thanks


Do you have the additional Graph module installed ?

This setting in emoncms/settings.php should control if the optional graph module or the standard visualistion gets called when the eye is clicked.

I installed the additional module.
Thanks for help.