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Although the OP is kind of old, and qt_creator is deprecated from fuerte, just trying to answer for the record (esp. there seem not an alternative as of today).

Not entirely sure but 1st of all, have you added the path of your package to $ROS_PACKAGE_PATH? Also, is Qt really installed? What does the following command return?

$ rospack find %YOUR_PACKAGE_NAME%
$ qmake --version

If something in the result looks wrong, fix it first.