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Use of Undeclared identifier QCARUnitiPlayer

Vuforia SDK Version: 5.0 - Description with steps to reproduce:

Hi,

I'm on Unity 5.1 and I've upgraded Vuforia From 4 to 5 but I've a problem on build:

Error: Use of Undeclared identifier QCARUnitiPlayer

Lines of code affected on file UnityAppController.mm:

QCARUnityPlayer::getInstance().QCARInit([orientation UTF8String]);

QCARUnityPlayer::getInstance().QCARSetOrientation([_unityView contentOrientation]);

 

and 

QCARUnityPlayer::getInstance().destroy();

 Can anyone help me? Thank you - Development OS (Mac OS X, Windows, Linux): Mac OS X yosemite - Mobile OS and Version: iOS 8.3 - Mobile Device Manufacturer and Model name: Apple iPad 2 - Do the Vuforia Sample Applications show the same behavior?: no