TOPIC: Paypal return error

I am getting the following error after making a payment through Paypal:

Error: Call to undefined function: paypalreturn() in /public_html/components/com_dtbilling/dtbilling.php on line 111

I double-checked and my return URL with Paypal is set up correctly.

This is the URL generated through dtbilling that Paypal is trying to send the customer to after payment:

https://www.mydomain.ca/index.php?optio ... mount=1.00

Any ideas on how I fix this?

A bit of additional info that may or may not be helpful:

I am using Paypal Website Payments Pro and have the Auto Return option turned on.

DT Billing is intended to be used with the standard paypal account. You do not need to setup any return URL... DT Billing handles all of that. If you are setting up other things on the paypal side, you are very likely messing up the intended process. Let it do its job without interference and you should be okay.

I tried it without the return URL set up on Paypal, and it throws the same error. I take it the component does not work if you have Paypal Pro?

Well, it was not intended for PayPal Pro use and never tested with it. It is designed to use a standard paypal account. As we haven\'t check into the integration of the Pro account, I can\'t say whether or not the component could work with PP Pro or not. All I can say is that we\'ve never tried it ourselves and that we have never promoted our components are supporting PayPal Pro.

This is not very helpful.

Has anyone else hit this problem, and did you find a solution for it?