That's not much to go on!
What version of Rhodes are you using? You need 5.0.30 to fully support iOS 8.x and Xcode 6.x.
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Just noticed this:
I built a Rho Mobile App for iOS plat successfully two years ago
A lot has changed in two years. You can't expect that a platform from two years ago will support current OSs.
You'll want to refer to the the migration guide:
FYI, the major jump is from 2.x/3.x to 4.x. 5.x is mainly a labeling/marketing change. Very little fundamental change from 4.x to 5.x. Use 5.0.30 for current iOS development.