A good hint appears repeatedly within the error message:
"No such file or directory in /home/roydahda/public_html/catalog/admin/image_handler.php"
which indicates Image Handler cannot find the file "image_handler.php" within /home/roydahda/public_html/catalog/admin/
Double check to ensure the file is contained within the /admin directory.
On a related note it appears your shop directory structure is not set-up quite correctly (it will work but will likely cause you difficulty in the future if not corrected). That is, instead of naming the directory which your zen cart is installed as "catalog", better to name the directory with your shopname or something similar.
e.g. /home/youraccountname/public_html/yourshopname/
Then the path to your admin directory will be:
/home/youraccountname/public_html/yourshopname/admin/
And the path to your "catalog" directory will be:
/home/youraccountname/public_html/yourshopname/includes/
With many mods install instructions, you will often observe the word "catalog" is used in context of specifying an EXAMPLE directory path, indicating the includes directory one level down from the shop root directory (e.g. /yourshopname/includes) to differentiate from /admin/includes. But in this regard the word catalog is not to be applied so literally.
Regarding your shipping mod question please do post your issue to the appropriate forum support thread. :)
Woody
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