[pmwiki-users] Invalid Page name when editing Site.SideBar

[Sandy]

When I try to edit Site.SideBar, it tells me:



PmWiki can't process your request
?invalid page name
We are sorry for any inconvenience.
Return to http://www.sandy.onebit.ca


I'm running pmwiki-2.2.42 .

I haven't touched the SideBar in years. I edited several other pages 
tonight with no problem.

Any ideas?

Thanks,

Sandy