https://devzone.nordicsemi.com/f/nordic-q-a/40303/what-to-addI don&#39;t speak English well. Please understand. The following error occurs. What should I add?en-USTelligent Community 13Mon, 12 Nov 2018 10:00:48 GMThttps://devzone.nordicsemi.com/thread/156839?ContentTypeID=1Mon, 12 Nov 2018 10:00:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:54f20186-8993-44e7-b991-9797ff5635fdSimon<p>This error happens in the linking process, the linker can&#39;t find any files that contain these functions. This might be solved by including the files which contains the mentioned functions into the Project,&nbsp;an explanation of how header (.h) and source (.c) files can be added can be found in&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/39240/starting-a-new-project-from-scratch/152242">this</a>&nbsp;link. If the error still remains after this, it might because some definitions are disabled in the sdk_config.h file, which may cause the functions to be &quot;grayed out&quot;.</p> <p>Please ask if anything is unclear.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>