[Carpet] Error when using moving grids

[Yosef Zlochower]

Hi,

   I am using CarpetRegrid2 and CarpetTracker to adjust the
grid to the position of the black holes. I get the following
error on the 512'th iteration.

Internal error: extrapolation in time.  time=511  times=[512]

I regrid every 256, but the black holes were essentially stationary,
so this may be the first time that carpet attempted to regrid.

I did not use any refinement in time, and set the prolongation
order in time to zero.

The parfile is attached.

Yosef

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