Pages and components not saving

[gra]

Hi,

My installation of Get Simple has suddenly stopped saving edited pages and components. When I enabled debugging, I got the following messages:


"Warning: copy(/home/acwfws/public_html/backups/pages/acwf-publications-pending.bak.xml) [function.copy]: failed to open stream: Permission denied in /home/acwfws/public_html/admin/changedata.php on line 131

Warning: SimpleXMLElement::asXML(/home/acwfws/public_html/data/pages/acwf-publications-pending.xml) [simplexmlelement.asxml]: failed to open stream: Permission denied in /home/acwfws/public_html/admin/inc/basic.php on line 273

Warning: SimpleXMLElement::asXML(/home/acwfws/public_html/sitemap.xml) [simplexmlelement.asxml]: failed to open stream: Permission denied in /home/acwfws/public_html/admin/inc/basic.php on line 273
Error: Headers already sent in /home/acwfws/public_html/admin/changedata.php on line 131 If your browser does not redirect you, click here"

I'm afraid my php is too rusty for me to make much sense of this. Can anyone assist, please.

Thanks,
Gra