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ROSWTF Problems

hyness-workstation@hynessworkstation-OptiPlex-755:~$ roswtf
Loaded plugin tf.tfwtf
No package or stack in context
================================================================================
Static checks summary:

Found 1 warning(s).
Warnings are things that may be just fine, but are sometimes at fault

WARNING ROS_HOSTNAME may be incorrect: ROS_HOSTNAME [ROS_IP] cannot be resolved to an IP address

================================================================================
Beginning tests of your ROS graph. These may take awhile...
analyzing graph...
... done analyzing graph
running graph rules...
ERROR: connection refused to [http://192.168.1.100:38906/]
... done running graph rules

Online checks summary:

Found 1 warning(s).
Warnings are things that may be just fine, but are sometimes at fault

WARNING The following node subscriptions are unconnected:
 * /turtlebot_dashboard_12116_1344524598265:
   * /diagnostics_toplevel_state


Found 4 error(s).

ERROR Communication with [/turtlebot_dashboard_12116_1344524598265] raised an error: 
ERROR Communication with [/rosout] raised an error: 
ERROR Could not contact the following nodes:
 * /turtlebot_dashboard_12116_1344524598265

ERROR The following nodes should be connected but aren't:
 * /turtlebot_dashboard_12116_1344524598265->/rosout (/rosout)

WHAT DO THESE ERRORS MEAN? HOW DO I FIX THEM? THANKS!