Latest version of Membership 2 Pro Not Compatible With Appointments+??


I am attempting to use Membership2 Pro with Appointments+, however when I do, I get the following error:

Warning: Missing argument 3 for App_Membership2::get_price() in ..appswordpresshtdocswp-contentpluginsappointmentsincludesclass_app_membership2.php on line 89.

I am presuming that perhaps something is not configured properly, but don't know the plugin well enough to figure out what is causing this.

Any assistance would be deeply appreciated.