I just attemted to clone a shipping module (storepickup) to create an identical module (COD). I went through and changed 'storepickup' to 'cod' and 'STOREPICKUP' to 'COD' in both the relevant files but now i get this error under the Admin/ shipping modules
Fatal error: Cannot redeclare class storepickup in /home/pow10934/public_html/includes/modules/shipping/storepickup.php on line 13

I cant work out where I went wrong, especially as line 13 doesn't seem relevant to the operation of the file?
Also the 'storepickup' module now doesnt show under 'shipping modules' and the 'COD' module is showing as MODULE_SHIPPING_COD_TEXT_TITLE instead of just 'COD'
Storepickup still shows up as an option to shoppers though?