When I try to view my October archive - I get the below error message

Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 11520 bytes) in /home/takingtheluk/public_html/blog/blogs/plugins/youtube_plugin/_youtube.plugin.php on line 418

Has any one any idea what the problem is.
It does not always show on the same entry
View the problam at www.ttlblog.co.uk

Thanks
John