linker error in Xcode project

Question

I am getting the following linker error:

Undefined symbols for architecture i386:
  "_OBJC_CLASS_$_Message", referenced from:
      objc-class-ref in DetailsViewController.o
     (maybe you meant: _OBJC_CLASS_$_Messages)
ld: symbol(s) not found for architecture i386
collect2: ld returned 1 exit status

How do I remove this? I checked in my DetailsViewController.m and I don't have any Message class anywhere in there

UPDATE:

Before this I had a warning: (this was caused because I added ShareKit into my project)

objc[59714]: Class Message is implemented in both /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk/System/Library/PrivateFrameworks/MIME.framework/MIME and /Users/aditya15417/Library/Application Support/iPhone Simulator/4.3.2/Applications/4EFD7570-AD87-48E8-8606-1D5633F65AD9/CTest.app/CTest. One of the two will be used. Which one is undefined.

As suggested by one guy from SO, I need to append the Message class with some other prefix.Therefore I changed the class name of Message to CVMessage everywhere in my class (basically whenever I see Messsage I'd replace it with CVMessage) and then I got this error

Answer 1

检查DetailsViewController是否在目标的“ Compile Sources中。

Answer 2

Run the static analyzer, and see if there are warnings in that file.

You are referencing Messages somewhere in there, even if all you are doing is making use of a call somewhere that's supposed to return a Message class...

You must have a Message class somewhere in your project, check and see if that is being compiled by your target.