Quote Originally Posted by relish View Post
On Zencart 1.5.0 ... we are getting this error when clicking 'new order' from Admin Home -> Customers -> Customers ... The website encountered an error while retrieving ...
What error message is recorded in the server logs as the cause of the "Internal Server Error"? What version of PHP is your web server running?

Quote Originally Posted by relish View Post
The link shown in the address bar is: "http://localhost/XXXXXX/new_order.php?cID=222&action=new"
Can I safely assume your admin folder is named XXXXXX (or you masked the admin name with XXXXXX)? Are you running this on localhost (or masking a domain)?