That's a standard Elgg URL. If your Elgg install can't find that URL it is seriously broken.

The file should be in /root-to-your-elgg/engine/handlers/action_handler.php

Check to see that it is there.

Thanks Kevin for your prompt reply,

the file is there and i have checked my .htaccess to, for me it is well configured.

please i really need help, i wanted my site to be up and running on the 31st, and this issue is delaying me.

Thanks again.

Kevin,

i have solved the problem,my .htaccess was misconfigured.

The pluggin works like a charm

Thanks