https://devzone.nordicsemi.com/f/nordic-q-a/30283/linking-errorDear Sir, I have downloaded the SDK12.3.0 , in that the example blinky freeRtos is giving the linking error i.e. &quot; Error: L6218E: Undefined symbol bsp_board_leds_init (referred from bsp.o).&quot; Please tell me how to get rid of this error. Regards, en-USTelligent Community 13Thu, 08 Feb 2018 09:54:16 GMThttps://devzone.nordicsemi.com/thread/120232?ContentTypeID=1Thu, 08 Feb 2018 09:54:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ce39b489-db88-497a-b72e-5261410b8f0dEdvin<p>If that doesn&#39;t solve it, check near the top of the .c files if there is an #ifdef with the module name. If they are not defined e.g. in sdk_config.h, make sure to add them, or the linker will not read the content between #ifdef MODULE_NAME and #endif.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/120066?ContentTypeID=1Wed, 07 Feb 2018 09:25:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ce7fd136-a899-4770-8581-481e95106ac6karthikeyan<p>hi,</p> <p>try to add necessary .h files in target-&gt;c/c++ preprocessor. and add all the .c files to your project</p><div style="clear:both;"></div>