Not support ENUM?

[shenguanjiejie]

typedef NS_ENUM(NSUInteger, RJCountryEnum) {
RJCountryEnum_China,
RJCountryEnum_Usa,
};

then I call:
kUserManager.country = RJCountryEnum_Usa;

error:
[RJPreferences setCountry:]: unrecognized selector sent to instance 0x1c0224e20