Проблема CorePlot в iPhone framework

Я следил за документацией CorePlot. После всего этого я столкнулся со следующей проблемой:

error: 'CPLayerHostingView' undeclared (first use in this function)

 error: 'hostingView' undeclared (first use in this function)

 error: expected expression before ')' token

 error: object cannot be set - either readonly property or no setter found

 error: object cannot be set - either readonly property or no setter found

 error: object cannot be set - either readonly property or no setter found

 error: object cannot be set - either readonly property or no setter found

 error: object cannot be set - either readonly property or no setter found

 error: object cannot be set - either readonly property or no setter found

В чем может быть проблема?