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datatype/md5sum error

Hi! I've been trying to run link text and i constantly get this error:

[ERROR] [1575375869.500571590]: Client [/firefly/trajectory_sampler] wants topic /firefly/path_segments to have datatype/md5sum [mav_planning_msgs/PolynomialTrajectory/2daf5d705534e84f80980f4673a0e62b], but our version has [mav_planning_msgs/PolynomialTrajectory4D/4d68d15524ede489eecd674bb6dc3ee8]. Dropping connection.

I was told that i may need another version of mav_comm folder ( link text ) but no matter what i try i get the same error. Can anyone tell me how to fix that??

Thank you!

I use ubuntu 16.04 and ROS kinetic.