Interesting to hear
that this is your "favorite" EnergyPlus error. If
it's a systemic or reoccurring error, that would tell me there's
something faulty in the EnergyPlus sizing algorithm, or at least for
certain conditions.
Or it could be user error.
>During Warmup, Environment=CZ06RV2 COLDEST DAY FROM
> WEATHER FILE, at Simulation time=12/28 00:00 - 00:15
Looks like you defined your design day or are using one of the extreme
periods from the weather file (SizingPeriod:* are the items that drive
the sizing calculations).
I believe the sizing calculations are well explained in the Engineering
Reference.