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RLException: Unable to contact my own server at [http://cyper:40771/].
This usually means that the network is not configured properly.
A common cause is that the machine cannot connect to itself.  Please check
for errors by running:
	ping cyper
For more tips, please see
	http://wiki.ros.org/ROS/NetworkSetup
The traceback for the exception was written to the log file

In the file "turtlesim-tf.lisp" write a function FOLLOW-TURTLE-IN-A-LOOP
which accepts 2 arguments: FOLLOWER-NAME and FOLLOWEE-NAME, which are turtle names,
e.g. the strings "turtle1" and "turtle2".
This function

initializes a new CL-TF:TRANSFORM-LISTENER and a new publisher
for turtle command velocities (see the SET-TURTLE-VELOCITY function from
assignment_6) that will send commands to the turtle called FOLLOWER-NAME.