by loren_d_c » Thu Jul 23, 2009 2:44 pm
This could happen if the file permissions or ownership of the ordernum file have changed so that ShopSite can no longer write to that file. You should contact your hosting provider about this. They should determine what system user your website is running as, and make sure that all of the files in your ShopSite Data Directory are owned by that user so that the data files are accessible by the ShopSite software.
-Loren