https://devzone.nordicsemi.com/f/nordic-q-a/72730/do-i-need-reinstall-the-c-98-libraryHello Sr, Take a look below Error, when I run the demo code from C:\..\nRF5_SDK_for_Thread_and_Zigbee_v4.1.0_32ce5f8\examples\multiprotocol\ble_thread\ble_thread_dyn_mtd_coap_cli Error[Li060]: module &quot;ip6_headers.o(libopenthread-mtd-optimized-mtden-USTelligent Community 13Mon, 15 Mar 2021 09:42:58 GMThttps://devzone.nordicsemi.com/thread/299700?ContentTypeID=1Mon, 15 Mar 2021 09:42:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6eb6477d-5682-42de-9d7e-86423b8e9f6eAmanda Hsieh<p>Hi Jixiang,&nbsp;</p> <p>I think you are using IAR. Please be aware that&nbsp;<span>nRF5_SDK_for_Thread_and_Zigbee_v4.1.0 is tested and verified with&nbsp;</span>IAR Workbench 7.80.4. See the <a href="https://infocenter.nordicsemi.com/topic/sdk_tz_v4.1.0/index.html">release notes</a>.&nbsp;</p> <p>Are you able to try&nbsp;<span>IAR Workbench 7.80.4? Also, see this <a href="https://devzone.nordicsemi.com/f/nordic-q-a/25518/code-is-not-link-compatible-with-the-new-c-14-library">post</a>.&nbsp;</span></p> <p><span>-Amanda H.</span></p><div style="clear:both;"></div>