Error in openflow library iphone

whenever I am adding an openflow library and execute, this 开发者_开发百科error occur

Undefined symbols:
  "_CATransform3DIdentity", referenced from:
      _CATransform3DIdentity$non_lazy_ptr in AFOpenFlowView.o
     (maybe you meant: _CATransform3DIdentity$non_lazy_ptr)
  "_CATransform3DRotate", referenced from:
      -[AFOpenFlowView(hidden) setUpInitialState] in AFOpenFlowView.o
      -[AFOpenFlowView(hidden) setUpInitialState] in AFOpenFlowView.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

Any one have any idea about it?

You need to add the "QuartzCore" framework to your app. The library you are using probably needs this framework, so your app needs to import this framework in order to compile.

Looks like you need to add the QuartzCore framework to your project. See this question for Xcode 3.2 or this question for Xcode4.