Thread:Project:Support desk/Error 500 with EasyTimeLine

I'm working all the day to install EasyTimeLine in my WK 1.19.2.

I tried every type of advice existing in the talk of EasyTimeLine Installation page but I get always the same error:
 * mod_fcgid: stderr: PHP Fatal error: Call to undefined method FSFileBackend::doQuickOperations in /my-domain-path/public_html/wk/extensions/Timeline.php on line 167, referer: http://www.common.it/wk/index.php?title=Common_Wiki:Sandbox2&action=edit

I don't think that the problem is about the position of pl command or of the timeline.php, but in the method called.

I also noticed that in the requirements is provided "NConvert", but in any part of the instructions for installation this is mentioned, so I think it is not required for Linux.

Someone can help me to resolve this issue?

Thanks in advance.