title: Undefined symbol while using Keil IDE
body: <p>I am using Nordic nRF51-DK SDK_11 and the soft device s130.</p>
  
  <p>I encountered the following error while adding device manager. I'm using Keil compiler.</p>
  
  <blockquote>
    <p>._build\nrf51422_xxac_s130.axf: Error: L6218E: Undefined symbol
    dm_init (referred from main.o). ._build\nrf51422_xxac_s130.axf: Error:
    L6218E: Undefined symbol dm_register (referred from main.o). Not
    enough information to list image symbols.</p>
  </blockquote>
  
  <p>I have included device_manager.h in the PATHS. Using Keil, I did it by going to Menu->Flash->Configure Flash Tools ... -> Include Paths -> Add components\ble\device_manager</p>
  
  <p>What else did I miss out?</p>