File Missing???

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I am getting this error message when I try to open the shop page:

Warning: main(includes/configure.php): failed to open stream: No such file or directory in /home/pjs/public_html/shop/includes/application_top.php on line 34

Fatal error: main(): Failed opening required 'includes/configure.php' (include_path='ptAl ') in /home/pjs/public_html/shop/includes/application_top.php on line 34

I havent changed anything on this site in over 6 months.  And now, all of a sudden I am getting this error?  I tried to use the back up site, but it is still coming up.  I checked the codes and nothing is wrong.

Any ideas? :?: