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
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-DISModel: 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 missingproperty parameters
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