Propertyvaluesholder: Couldn't Find Setter/getter For Property Alpha With Value Type Float

i thought nineoldandroids is a framework for API lower then HONEYCOMB... so what do i wrong?? my HTC Android 2.2.1 throws this error (Couldn't find setter/getter for property alpha

Solution 1:

After some tries, i replaced all PropertyValuesHolder with ObjectAnimator (with float vars)