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It looks like the gazebo_worlds package in ROS Groovy contains some very old .world files that use a syntax that's no longer supported. Specifically, these .world files will fail to parse:

3stacks.world
balcony.world
camera.world
elevator.world
empty_listener.world
grasp.world
scan.world
simple_erratic.world
simple_office_table.world
simple_office.world
simple.world
test_friction.world
wg.world

So you should avoid using those .world files, including the .launch files that refer to them.

Note that the simulator_gazebo stack (which contains the gazebo_worlds package) has been deprecated starting in ROS Groovy and will no longer be distributed in ROS Hydro.