Error Call to undefined method os_payment::os_payment()

My name is Tito

I have been trying for several days to implement a payment gateway through the Event Booking plugin.I have followed all the configuration steps and generated categories and events. I have installed the Redsys plugins but when I press place an order I get the error screen.0 Call to undefined method os_payment::os_payment()It appears the page you were looking for doesn't exist. Sorry about that.

Hello Alfonso

Please update your site to the latest version 3.15.1 of Events Booking which was released earlier today, then try again. The error should be gone

Tuan

Hi Tuan
Upgrading to 3.15.1 gives me error 500

Hi Tuan
I have now purchased Payment Form, to try another way but when installing it I get:
"Error
Path does not have a valid package.
Unable to detect manifest file."
And my Joomla is updated to 3.9.26

Hello Alfonso

Please submit a support ticket sending us super admin account of your site and link to registration form so that I can check it

Tuan