用Aspenplus V8.8反应精馏模拟亚硝酸甲酯，出现参数缺失，如何解决

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用Aspenplus V8.8反应精馏模拟亚硝酸甲酯，添加了nistv88数据库。出现下列错误，请问如何解决？谢谢！


  Flowsheet Analysis :

COMPUTATION ORDER FOR THE FLOWSHEET:
REA-DIS

->Calculations begin ...


   Block: REA-DIS  Model: RADFRAC
      WATSON HEAT OF VAPORIZATION MODEL HAS MISSING PARAMETERS:
      DHVLWT/1ST ELEMENT (DATA SET 1) MISSING FOR COMPONENT ESTER

      DHVLWT/2ND ELEMENT (DATA SET 1) MISSING FOR COMPONENT ESTER

  ****PROPERTY PARAMETER ERROR
      ERRORS ENCOUNTERED IN CALCULATION OF LIQUID MIXTURE MOLAR ENTHALPY USING
      OPTION SET NRTL-RK FOR H.

! Calculations stopped because of missing  property parameters