建模过程中遇到的问题

crocodile1981

在用ASPEN PLUS建了一个气分模型，提高丙烷纯度后发生了
“STREAMS CROSSING THE LOOP CONVERGED BY $OLVER01 ARE NOT IN MASS BALANCE:
      MASS INLET FLOW = 0.10287988E+02, MASS OUTLET FLOW = 0.10286675E+02
      RELATIVE DIFFERENCE = 0.12768852E-03
      IMBALANCE MAY BE DUE TO A LARGE RECYCLE FLOW, AND A
      RELATIVELY LOOSE TEAR STREAM TOLERANCE.”这个报警，请教各位高手这个问题是怎么回事？如何解决？