Linux Kdevelop Can't detect my own header/cpp Files

Hello everyone I’m using U4.21 with Kdevelop 5.2.1 to develop basic things. I am still trying to learn.

My problem is my classes don’t detect their own header files. As you can see here I have ABarracks defined and included but Kdevelop still can’t detect the class.

And also it doesn’t look like colouring works according to syntax. But I think it’s related to the same problem.

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