My b2evolution Version: Not Entered

I need a help, i put the new version beta, and upload it,
and when open the site it show error and i can't know from where it come

http://rss-dubai.com/blogs/

it show this error
Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 207 bytes) in /hsphere/local/home/prostay/rss-dubai.com/blogs/inc/_misc/_db.class.php on line 693

and thanks a lot for help

Sincerely
Makaros