How can I fix “unresolved inclusion: “?

How can I fix “unresolved inclusion: “?

BY 24 Mar 2019 SDK & IDE

Hi,

I added xxx.h file for c++ class and add #include<functional>.

But, I cannot install my project because “unresolved inclusion: <functional>” error is shown.

How can I fix it? It is c++ standard library.

* Tizen version : 4.0 (wearable)

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