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Sorry if replying to old questions is bad form, but I had this same problem and got extremely frustrated with it. Well, after a few hours I realized the parameter path was slightly wrong. Like, one letter. Fixed that and it worked... So triple check that! For example, OP may have had a namespace so that the param name should have been something like /turtlebot/mobile_base/use_imu_heading, not just /mobile_base/use_imu_heading. Also, check that you did not forget the / at the end of the param tag, before the >.