I am trying to enable ble_nus for wireless uart communication so I can send data from my device to a phone with the nordic app installed. I looked at the UART example and tried to set up a NUS service so I can use ble_nus_send_string function. When I compile my code I get this error "ble_link_ctx_manager.h: No such file or directory" which doesn't make sense since I have added the ble_link_ctx_manger.h to my library folder. I also have almost the same sdk_config as the UART Example in the NRF52 SDK 15.