Hi everybody, I get a strange error when I try to do a transformPose: [ERROR] ... Could not find a common time /base_link and /map and [ERROR] ... Could not find a connection between /base_link and /map because they are not part of the same tree. But when I start tf_echo /base_link /map there is a proper transformation. The error occurred suddenly when I started a launch-file which did work without any problem at the last startup. 'rosrun tf reset_time.py' solves the problem for a short time, but after some successful calls of "transformPose" the error is back again. Any ideas? Greetings from the RoboCup German Open in Magdeburg, Sabrina