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EnergyPlus severe error - CalcIndirectResearchSpecialEvapCooler

What is the significance of the error,I have used 2ZoneHVACDatacenter idf file. How do i solve this problem ?

ERROR :

 ** Severe  ** CalcIndirectResearchSpecialEvapCooler: calculate secondary air mass flow failed for Indirect Evaporative Cooler Research Special = EAST DATA CENTER IEC
   **   ~~~   **  Environment=WHOLEYEARDAY, at Simulation time=03/26 18:15 - 18:30
   **   ~~~   **   Iteration limit [500] exceeded in calculating secondary air mass flow rate
   **   ~~~   **   Simulation continues
   ** Severe  ** CalcIndirectResearchSpecialEvapCooler: calculate secondary air mass flow failed for Indirect Evaporative Cooler Research Special = WEST DATA CENTER IEC
   **   ~~~   **  Environment=WHOLEYEARDAY, at Simulation time=03/27 06:03 - 06:05
   **   ~~~   **   Iteration limit [500] exceeded in calculating secondary air mass flow rate
   **   ~~~   **   Simulation continues

EnergyPlus severe error - CalcIndirectResearchSpecialEvapCooler

What is the significance of the error,I have used 2ZoneHVACDatacenter idf file. How do i solve this problem ?

ERROR :

 ** Severe  ** CalcIndirectResearchSpecialEvapCooler: calculate secondary air mass flow failed for Indirect Evaporative Cooler Research Special = EAST DATA CENTER IEC
   **   ~~~   **  Environment=WHOLEYEARDAY, at Simulation time=03/26 18:15 - 18:30
   **   ~~~   **   Iteration limit [500] exceeded in calculating secondary air mass flow rate
   **   ~~~   **   Simulation continues
   ** Severe  ** CalcIndirectResearchSpecialEvapCooler: calculate secondary air mass flow failed for Indirect Evaporative Cooler Research Special = WEST DATA CENTER IEC
   **   ~~~   **  Environment=WHOLEYEARDAY, at Simulation time=03/27 06:03 - 06:05
   **   ~~~   **   Iteration limit [500] exceeded in calculating secondary air mass flow rate
   **   ~~~   **   Simulation continues