吸收塔中遇到的问题，求助解决方案

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吸收塔中遇到的问题，求助解决方案，怎么调
Block: T0101    Model: RADFRAC
  *** SEVERE ERROR
      A LIQUID FEED/PUMPAROUND TO THE TOP STAGE IS REQUIRED WHEN
      "Q1=0" IS SPECIFIED IN "COL-SPECS"; REQUIRED FEED/PUMPAROUND
      HAS ZERO FLOW.

  *** SEVERE ERROR
      A VAPOR FEED/PUMPAROUND TO THE BOTTOM STAGE IS REQUIRED WHEN
      "QN=0" IS SPECIFIED IN "COL-SPECS"; REQUIRED FEED/PUMPAROUND
      HAS ZERO FLOW.

  *   WARNING
      REST OF BLOCK BYPASSED DUE TO SEVERE ERROR.