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Some problems about creating my first msg

I’m a beginner of ros, I met a problems about creating my first topic.
The flowing is the problem,it just a warning,the real error is that the cmake can not find the *.h which I had included in my *.cpp, but I think it had a relation with this waring :
“Policy CMP0046 is not set: Error on non-existent dependency in add_dependencies.”
Is it the problem of Cmake’s version ? How can I solve it ?
my Cmake version is 2.8.3

I don’t think that the warning and the error are related. The warning is about a CMake policy that is not set. See the documentation for an explanation. This is only a warning. To write your first message, you can follow this tutorial. Take a close look at the CMakeLists.txt part of the tutorial.

Please ask such questions on following the support guidelines:

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