Adding a new library in a Keil project

[Francesca]

Hi!I'm having some problems in adding a new library to my project (sdk 11.0.0,s130), I want to add ble_nus.h. I follow this instructions "devzone.nordicsemi.com/.../" but it still doesn't work. someone can help me, please?thank you!

[Francesca]

I have added the screenshot of what I see, there is the .c file in the nrf_ble folder, but in the code there is still the error.