eWay Giving a Blank Screen

Hi, I am setting up eWay as a Payment gateway. I have followed these instructions (https://stackideas.com/docs/payplans/administrators/payment-gateways/eway), it all seems pretty straight forward.

I have the access info from the client but when I go to test the gateway it just gives me a blank screen with the following URL (https://2017.essbiztools.com.au/administrator/index.php?option=com_payplans&;view=app)

Can you please have a look for me?

You can select a plan from here: https://2017.essbiztools.com.au/membership

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