ros启动时候出现下边的问题,求助解决办法
15537853236
15537853236 669 0
2017-09-25 13:03
. logging to /home/pp/.ros/log/a0b54000-a1ac-11e7-88cc-303a64604320/roslaunch-dell-3511.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.


Unable to contact my own server at [http://IP_OF_PC:42017/].
This usually means that the network is not configured properly.


A common cause is that the machine cannot ping itself.  Please check
for errors by running:


 ping ip_of_pc


For more tips, please see


 http://www.ros.org/wiki/ROS/NetworkSetup


The traceback for the exception was written to the log file
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