在氯乙烯精制工段ASPEN出现以下问题，求解决

331082jin

      
  *   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 missing  property parameters
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forever999

缺少物性参数CPIG

331082jin

能解释下具体解决步骤吗，请指导