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[EnergyPlus_Support] Question on CoolingCoil error message

Currently running the simulation on DOAS with Pakaged Terminal Heat 
Pump, The center Zone of the building is served by DOAS and Out Zone
(parameter Zone) is served by Packaged Terminal Heat Pump.
At first, The simulation of building served by VAVsystem is successful.
But second simulation model doesn't work due to those problem below.
I've already adusted capacity of DETAILED COOLING COIL to autosizing.
Above all, I really don't know fatal error what it is.
I'm so tried of this repeated problem 
 
** Warning ** COIL:Water:DetailedFlatCooling in Coil =DETAILED COOLING 
COIL
   **   ~~~   ** Air Flow Rate Velocity has greatly exceeded upper 
design guidelines of ~2.5 m/s
   **   ~~~   ** Air MassFlowRate[kg/s]=55.429247
   **   ~~~   ** Air Face Velocity[m/s]=NAN
   **   ~~~   ** Approximate MassFlowRate limit for Face Area[kg/s]=NAN
   **   ~~~   ** COIL:Water:DetailedFlatCooling could be 
resized/autosized to handle capacity
   **  Fatal  ** Variable Z (NAN) out of range [0.0,1.0] in 
CalculateEpsFromNTUandZ

Please let me know the method of this problem.




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