Cannot Create Local Lock File

[Lucidgreen]

There is one page on my website that when I press "edit page", it says that it
"cannot create a local lock file". Every other page on the website can at
least access the edit screen, except this one.

The website is http://www.ergofitconsulting.com/ , go to the "about us", then
the "presentations" tab, you will notice that it then has 3 sub-selections
"nationaol", "regional", and "local". This is the only thing I can see that
might set it apart from the other pages for editing, the fact that it has an
additional layer of selections.

Like I say, this is the only page which will not open up in edit mode. I did
not design the page, I am just some hired help trying to figure out how to
paste in some updated changes. If anyone can help me, I'd much appreciate it.