毕设新手，流程模拟中出现干板，且没有流股进料，求大神帮助
SEVERE ERRORTHE FOLLOWING STAGES DRIED UP (VAPOR OR LIQUID FLOW APPROACHES 0):
21 22 25
A LIMIT OF0.10000E-04 * SUM OF FEEDS WAS IMPOSED ON THE FLOW RATES
OR A LIMIT OF0.10000E-04 WAS IMPOSED ON THE STAGE V/L OR L/V RATIO.
INFORMATION
CALCULATED REBOILER DUTY IS NEGATIVE.
Block: 2 Model: FSPLIT
* WARNING
ZERO FEED TO THE BLOCK. BLOCK BYPASSED
Block: C1 Model: COMPR
* WARNING
TOTAL FLOW IS ZERO. BLOCK IS BYPASSED.
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