Error in main.o

[Newbie]

Hello, I am using nrf51 and firmware is ble_app_gls. I have modified my code to work for dfu as well. I am getting error as follows

.\_build\nrf51422_xxac.axf: Error: L6218E: Undefined symbol ble_dfu_init (referred from main.o).
.\_build\nrf51422_xxac.axf: Error: L6218E: Undefined symbol ble_dfu_on_ble_evt (referred from main.o).
.\_build\nrf51422_xxac.axf: Error: L6218E: Undefined symbol ble_gls_init (referred from main.o).

I am attaching my main file with this.

ThanksNew Text Document.txt

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Makefile Makefile

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[Newbie]

Yes I have added the services in my code. This is the code www.dropbox.com/.../ble_app_gls.rar