在氯乙烯精制工段ASPEN出现以下问题，求解决
* WARNING IN THE "STREAM" PARAGRAPH WHICH BEGINS ON LINE 51
STREAM NAME: 1
COMPONENT MOLE FLOWS OF SUBSTREAM: "MIXED"
ARE NORMALIZED TO THE TOTAL MOLE FLOW VALUE.
Flowsheet Analysis :
COMPUTATION ORDER FOR THE FLOWSHEET:
B1 B3 B2
->Calculations begin ...
IDEAL GAS MODEL HAS MISSING PARAMETERS:
CPIG/1ST ELEMENT (DATA SET 1) MISSING FOR COMPONENT C2H4CL2
****PROPERTY PARAMETER ERROR
ERRORS ENCOUNTERED IN CALCULATION OF IDEAL GAS PROPS FOR
HIG
PLEASE FIX THE ERRORS, RE-INITIALIZE, AND RUN AGAIN.
! Calculations stopped because of missingproperty parameters
<< Run Saved >>
<< Run Saved >>
缺少物性参数CPIG 能解释下具体解决步骤吗，请指导
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