hector-mapping Lookup would require extrapolation into the future

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Hi,

i try to run hector-slam on the asctec pelican. But when i launch hector-mapping i get the following error:

[ERROR] [1230818054.341736259]: Transform failed during publishing of map_odom transform: Lookup would require extrapolation into the future.  Requested time 1230818053.694549500 but the latest data is at time 1230818053.195532500, when looking up transform from frame [/base_link] to frame [/nav]

If i am right, that error means that my tf data is to old so it is not used or ? I have tried to set the publish rate of tf higher (up to 1000Hz), but the error keeps. I also have make sure that i do not use the sim time.