CCFiniteTimeAction* CCSequence::actions(a,b,…);
CCFiniteTimeAction* CCSpawn::actions(a,b,…);
These are the definition written in cocos2dx CCActionInterval.cpp codes.
These two functions cause type mismatch when they are passed into the CCEase as an argument, because CCEase receives only CCActionInterval.
Therefore I would like to suggest that return value has to be changed from CCFiniteTimeAction* to CCSequence and CCSpawn respectively.
Please consider this one for the next update.
Thanks!