Quote Originally Posted by mvstudio View Post
Thanks. Yeah, that file is on the deprecated Square plugin which according to the Square WebPay instructions should be removed. Makes no sense to have a plugin that won't work installed so another one could work, unless I'm missing something?

Perhaps an update to the Square WebPay is in order to include that or any other files needed for this new version to work
When it says 'remove' that means clicking 'Remove Module' in Admin > Modules > Payment : Square