Softaculous > Software > General scripts and then click update.
If that doesn't fix it check here: https://www.softaculous.com/docs/INFO.xml_not_found.
If you are using InterWorx see Inodecloud's post if the above doesn't fix it: http://forums.interworx.com/threads/8098-Simple-Scripts-and-Softaculous?p=27064#post27064
