/learn/learning-center/stem-academy/stem-projects/b/blog/posts/book-carrying-robot-7-practical-considerations-and-debuggingAfter I showed my software design in this post , my hardware design in this post , and that I got some output in this post .I started to test my robot on actual tasks, that&#39;s when I figured out some bugs in my code, also I had to change some paramet.en-USTelligent Community 12https://community.element14.com/learn/learning-center/stem-academy/stem-projects/b/blog/posts/book-carrying-robot-7-practical-considerations-and-debuggingTue, 09 Feb 2016 21:01:04 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:cf6b9408-da43-410f-baaf-5d28b2572094Former Member2<p>Hi,</p><p>When I try to compile the model, I get this weird error message: <span style="font-style:normal;font-weight:normal;text-align:start;text-indent:0px;">Changing property &#39;ProdHWDeviceType&#39; is not allowed</span></p><p>&nbsp;</p><p><span style="font-style:normal;font-weight:normal;text-align:start;text-indent:0px;">Any clue why that might be doing that? I&#39;m running this on R2015b.</span></p><img src="https://community.element14.com/aggbug?PostID=423&AppID=195&AppType=Weblog&ContentType=0" width="1" height="1">