https://devzone.nordicsemi.com/f/nordic-q-a/18797/no-rule-to-make-target-_build-app_trace-o-needed-by-nrf52832_xxaa_s132-stopi am working with eclipse to program the ble_app_hrs but it is getting error &quot;No rule to make target _build/app_trace.o&#39;, needed by nrf52832_xxaa_s132&#39;. Stop&quot; when it builds .. pl help meen-USTelligent Community 13Fri, 13 Oct 2017 21:48:23 GMThttps://devzone.nordicsemi.com/thread/72598?ContentTypeID=1Fri, 13 Oct 2017 21:48:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3f465ea8-030b-4c3e-8161-c92b299984daMichael M<p>I ran into the same problem and was able to solve it by making sure the Thingy SDK location does not include any spaces in the containing directory names. For example, &quot;~/Test_It/thingy_sdk&quot; works using Eclipse but &quot;~/Test It/thingy_sdk&quot; does not an you get an error similar to yours.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/72597?ContentTypeID=1Thu, 05 Jan 2017 09:45:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:717441f5-f128-48ca-b347-3747f9dd0bc7J&#248;rgen Holmefjord<p>Are you using SDK 12 here as well, like in the <a href="https://devzone.nordicsemi.com/question/109587/undefined-reference-to-fs_queued_op_count_get/">other case you posted</a>? app_trace is not part of SDK 12. Is this a clean project, or an old project you are trying to migrate from an older SDK version?</p><div style="clear:both;"></div>