Building ‘ble_app_uart_pca10056e_s140’ from solution ‘ble_app_uart_pca10056e_s140’ in configuration ‘Release’
  Linking ble_app_uart_pca10056e_s140.elf
    "C:/Program Files/SEGGER/SEGGER Embedded Studio for ARM 4.30a/gcc/arm-none-eabi/bin/ld" -X --omagic -eReset_Handler --defsym=__vfprintf=__vfprintf_long --defsym=__vfscanf=__vfscanf_long -EL --gc-sections "-TC:/Nordic/nRF5_SDK_15.3.0_59ac345/examples/ble_peripheral/ble_app_uart/pca10056e_811DK/s140/ses/Output/ble_app_uart_pca10056e_s140 Release/Obj/ble_app_uart_pca10056e_s140.ld" -Map Output/Release/Exe/ble_app_uart_pca10056e_s140.map -u_vectors -o Output/Release/Exe/ble_app_uart_pca10056e_s140.elf --emit-relocs --start-group "@C:/Nordic/nRF5_SDK_15.3.0_59ac345/examples/ble_peripheral/ble_app_uart/pca10056e_811DK/s140/ses/Output/ble_app_uart_pca10056e_s140 Release/Obj/ble_app_uart_pca10056e_s140.ind" --end-group
    Output/ble_app_uart_pca10056e_s140 Release/Obj/main.o: in function `sleep_mode_enter':
    main.c:(.text.sleep_mode_enter+0x4): undefined reference to `bsp_indication_set'
    main.c:(.text.sleep_mode_enter+0xe): undefined reference to `bsp_btn_ble_sleep_mode_prepare'
    Output/ble_app_uart_pca10056e_s140 Release/Obj/main.o: in function `ble_evt_handler':
    main.c:(.text.ble_evt_handler+0x2e): undefined reference to `bsp_indication_set'
    Output/ble_app_uart_pca10056e_s140 Release/Obj/main.o: in function `bsp_event_handler':
    main.c:(.text.bsp_event_handler+0x3c): undefined reference to `ble_advertising_restart_without_whitelist'
    Output/ble_app_uart_pca10056e_s140 Release/Obj/main.o: in function `on_adv_evt':
    main.c:(.text.on_adv_evt+0xa): undefined reference to `bsp_indication_set'
    Output/ble_app_uart_pca10056e_s140 Release/Obj/main.o: in function `main':
    main.c:(.text.startup.main+0x58): undefined reference to `bsp_init'
    main.c:(.text.startup.main+0x66): undefined reference to `bsp_btn_ble_init'
    main.c:(.text.startup.main+0x14a): undefined reference to `ble_advertising_init'
    main.c:(.text.startup.main+0x158): undefined reference to `ble_advertising_conn_cfg_tag_set'
    main.c:(.text.startup.main+0x1b6): undefined reference to `ble_advertising_start'
    Output/ble_app_uart_pca10056e_s140 Release/Obj/main.o:(.sdh_ble_observers1+0x0): undefined reference to `ble_advertising_on_ble_evt'
    Output/ble_app_uart_pca10056e_s140 Release/Obj/main.o:(.sdh_soc_observers1+0x0): undefined reference to `ble_advertising_on_sys_evt'
Build failed