aspen模拟气化问题

province

decomp模拟煤浆热解，ryield模拟，运行过程中出现错误：
  WARNING
   SPECIFIED YIELDS HAVE BEEN NORMALIZED BY A FACTOR OF (1.02618)
   TO MAINTAIN AN OVERALL MATERIAL BALANCE.
*  WARNING
   THE FOLLOWING ELEMENTS ARE NOT IN ATOM BALANCE:
   H     N     S     C


  求助该问题主要出现在哪一步，如何解决该问题，谢谢！