IOS maximumAvailableDiskSpace build error

I try to limit cache size of assetbundle.

It work very well in android platform. but I can’t build in IOS platform with message from xcode

(Filename: /Applications/buildAgent/work/d3d49558e4d408f4/artifacts/iPhonePlayer-armv7Generated/UnityEngineDebug.cpp Line: 53)

Unregistered icall ‘UnityEngine.Caching:set_maximumAvailableDiskSpace (long)’

There is no comment about IOS platform exception with maximumAvailableDiskSpace. I think it is bug of unity.

I use unity 4.3.4.

How can I fix it?

Yeah, I think that API isn’t supported on iOS, so as you suggest, is a documentation bug. Please submit a bug report for that.