class-dump gives error "Error: Cannot find offset for address in dataOffset for address"?

I am trying to dump the springboard headers from my mac

using following command

class-dump /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk/System/Library/CoreServices/SpringBoard.app/SpringBoard -H -o /Desktop/SpringBoard`

but I am getting the following error :

Error: Cannot find offset for address 0x38a56a2c in dataOffsetForAddress:

I downloaded the class-dump command line tool from http://www.codethecode.com/projects/class-dump and copied the class-dump file to my usr/bin/ directory

So anyone please let me know 开发者_Python百科what went wrong?

On my system (OS X 10.10 with Xcode 6.0) I had to cd to: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/CoreServices/SpringBoard.app

From there I used class-dump version 3.5 (64-bit) like this:

$ class-dump SpringBoard -H -o ~/Desktop/SpringBoard

This resulted in the headers you can find here. Sorry that I don't have the 3.0 SDK available to test against.