QuickLook project 1333 Errors

Hello NG,

I started today to write a QuickLook plugin for my app. It somehow
dose not like my header files and I don't know why. I do nothing else
than in the QuickLookSketch-example. When I try to compile it steps
into my header file than into cocoa.h, than in foundation.h. There it
catches the first error at a @class statement:

syntax error before '@' token

The next is:

syntax error before '*' token.

This happens in all header files it steps through.
I really don't know what is happening here since my headers and
objects compile well in other projects.

TIA Florian