Invalid iOS SDK Bundle

[Ray]

Can anybody help me save a standalone for an iPad?

I’m currently choosing:
    Livecode
    Preferences
    Mobile Support
    Add entry
    4.3 or later   -   select your xCode App Bundle

But I get “The chosen folder is not a valid iOS SDK”

The software I’m using is:
    Mac OS 10.10.2
    Livecode 7.0.2 RC2
    xCode 6.3.2

These are the most recent versions.  Should I back down some of these to 
a previous version?