Fatal error: Call to undefined method USC_eShop_Shipping_Extension_UPS::set_notice() in /home/comapeno/public_html/wp-content/plugins/eshop-shipping-extension-ups/eshop-shipping-extension-ups.php on line 65”
set_notice() function is defined by the parent plugin eShop Shipping Extension. Do you have it installed and active? If not, you can get it from http://wordpress.org/extend/plugins/eshop-shipping-extension/. If you do have it installed, however, please make sure you have the latest version (2.0.1 at the time of writing this post) of eSE and also of UPS module (v2.0) which you can get from the download link you received by email when you purchased the module.
Apparently I had the plugin activated, so I tried disabling and enabling the eShop Shipping Extension plugin and found this error: “Failed to install module file: ups-cert.pem (copy(wp-content/plugins/eshop-shipping-extension/includes/third-party/cert/ups-cert.pem) [function.copy]: failed to open stream: Permission denied)”. So I changed the permissions on the plugin folder and everything worked.