EB_INVALID_REGISTRATION_CODE message on home page

Hi,
After a successful payment the client is send back to the home page and gets the message: "message EB_INVALID_REGISTRATION_CODE".
Payment is done with JDiDEAL payment plugin. In the JD iDEAL Gateway component the payment is listed as successful but EB keeps the transaction on PENDING.

So three questions:
1. how to get rid of the message EB_INVALID_REGISTRATION_CODE and get a successful message instead?
2. how to get EB to register the successful payment?
3. how to get the message on the form page instead of the home page?

I hope you can help me out.
Regards,
Jaap

JD iDEAL Gateway 4.2.1
Event Booking version 2.9.0
Joomla 3.6.2

(I posted this item in the wrong category before, sorry)

Hi Jaap

This is something causes by JDiDEAL payment plugin, so please contact the developer of that payment plugin and ask him to check it for you

Also, if it is possible, you should update your site to latest version of both Events Booking and the payment plugin

Regards,

Tuan