Envato Code Canyon USPS WooCommerce Shipping Plugin
Just downloaded US Postal Service USPS WooCommerce Shipping Plugin for Rates and Tracking and I went to install it on my website staged at wp engine. I got a message Unpacking the package… Installing the plugin… Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘TransferOutBeforeUpgrade’ not found or invalid function name in /nas/content/staging/bestbrella/wp-includes/class-wp-hook.php on line 286 The package could not be installed. No valid plugins were found. Plugin installation failed. Return to Plugin Installer 'is this because I’m using a staged site? Or do I have to enter a license number before installing?
I then went back and downloaded the license info.
Tried again, same problem