tf::TransformListener lookupTransform time error

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Hi,

I'm trying to listen to a transform using a tf::TransformListener, but I get the following error:

[ERROR] [1320937607.066118093]: Exception thrown while processing service call: 
Lookup would require extrapolation at time 1320937602.045533235, 
but only time 1320937602.055791850 is in the buffer, 
when looking up transform from frame [/base_link] to frame [/mid_obj_preg_0]

I don't understand why I'm getting this error: if you look at the 2 time stamps, they're very close, and I initialized my tf_listener with a big buffer of 60seconds.

I also ran the view frames, and you can see that there's a transform from /base_link to /mid_obj_preg_0.

The transforms from /camera_rgb_optical_frame to /mid_obj_preg_0 are published by the same tf::TransformBroadcaster. Should I be using one broadcaster per transform?