Loaded plugin tf.tfwtf
No package or stack in the current directory
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Static checks summary:

No errors or warnings
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Beginning tests of your ROS graph. These may take a while...
analyzing graph...
... done analyzing graph
running graph rules...
... done running graph rules
running tf checks, this will take a second...
... tf checks complete

Online checks summary:

Found 3 warning(s).
Warnings are things that may be just fine, but are sometimes at fault

WARNING The following node subscriptions are unconnected:
 * /gazebo:
   * /gazebo/set_link_state
   * /gazebo/set_model_state

WARNING These nodes have died:
 * spawn_urdf-6

WARNING Received out-of-date/future transforms:
 * receiving transform from [/robot_state_publisher] that differed from ROS time by 381.389s