Just finished upgrading from 1.5.5f to 1.5.7c, followed directions exactly as they are written in the upgrade post.

I can log into the admin just fine. Main store page (customer facing) will not load.

Error log states:
#1 require() called at [/home/andrewangelina/public_html/dragonqueenwinery.us/store_new/index.php:41]
--> PHP Warning: require(/home/andrewangelina/public_html/dragonqueenwinery.us/store_new/DIR_WS_INSTALL_TEMPLATEcommon/html_header.php): failed to open stream: No such file or directory in /home/andrewangelina/public_html/dragonqueenwinery.us/store_new/index.php on line 41.

Can anyone point me in the right direction?
Thanks,
Andrew