[(path_check, "PATH has /usr/bin set before ROS_ROOT/bin, which can ca
use problems as there is system install of ROS on this machine. You ma
y wish to put ROS_ROOT/bin first"), (lambda ctx: ctx.ros_package_path
is None, "ROS_PACKAGE_PATH is not set. This is not required, but is un
usual"), (lambda ctx: len(paths(ctx.ros_package_path))== 0, "ROS_PACKA
GE_PATH is empty. This is not required, but is unusual"), (lambda ctx:
not ctx.ros_master_uri, "ROS_MASTER_URI is empty. This is not require
d, but is unusual"), (ros_master_uri_hostname, "Cannot resolve hostnam
...
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