I checked if my plugin is included to the cmake file, and, yes, it is.
I then run "$cmake sitl_gazebo" in the Tools folder, I assume, that is what you said I need to do. Then I got that in responce
I looked into the error log, but I couldnt understand how error which I got is connected with my actions. So I dont't know what to do now. I'm adding here error log, may be you have any ideas.