<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Good afternoon,</div><div class=""><br class=""></div><div class="">In the Version 7 of Gazebo, I get this error message when I try to run one world modified by me. </div><div class=""><br class=""></div><div class="">Any idea about can it be happening? The default world of JdeRobot works perfectly.</div><div class=""><br class=""></div><div class="">Thanks in advance,</div><div class="">Arturo.</div><div class=""><br class=""></div><img name="Captura de pantalla de 2017-02-11 17-55-12.png" apple-inline="yes" id="EFE2D69F-415B-4272-8718-380B5C0C95D5" src="cid:5F07CFE4-3487-4D4F-9490-02D1850AF06D@t.hu" class=""><div class=""><br class=""></div></body></html>