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[EnergyPlus_Support] Error - Need the meaning

Can anyone explain this to me? Please?

Program Version,EnergyPlus, 3/31/2011 7:57 PM,IDD_Version
   ************* Beginning Zone Sizing Calculations
   ** Severe  ** DualSetPointWithDeadBand: Effective heating set-point higher than effective cooling set-point - increase deadband if using unmixed air model
   **   ~~~   ** occurs in Zone=ZONE ONE During Warmup & Sizing, Environment=CHICAGO_IL_USA COOLING .4% CONDITIONS DB=>MWB, at Simulation time=07/21 00:00 - 00:05
   **   ~~~   ** LoadToHeatingSetPoint=13.327, LoadToCoolingSetPoint=-948.477
   **   ~~~   ** Zone TempDepZnLd=961.80
   **   ~~~   ** Zone TempIndZnLd=22108.16
   **   ~~~   ** Zone ThermostatSetPoint=0.00
   **   ~~~   ** Zone HeatingSetPointOffset=0.00
   **   ~~~   ** Zone CoolingSetPointOffset=0.00
   **  Fatal  ** Program terminates due to above conditions.
   ...Summary of Errors that led to program termination:
   ..... Reference severe error count=1
   ..... Last severe error=DualSetPointWithDeadBand: Effective heating set-point higher than effective cooling set-point - increase deadband if using unmixed air model
   ************* Warning:  Node connection errors not checked - most system input has not been read (see previous warning).
   ************* Fatal error -- final processing.  Program exited before simulations began.  See previous error messages.
   ************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.
   ************* EnergyPlus Sizing Error Summary. During Sizing: 0 Warning; 1 Severe Errors.
   ************* EnergyPlus Terminated--Fatal Error Detected. 0 Warning; 1 Severe Errors; Elapsed Time=00hr 00min  1.06sec





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