Mapped variables have to appear in the model
*** The following MCP errors were detected in model CNDECGEM:
483 R no ref to var in equ.var
如上图。我运行代码时显示变量未显示在模型中。想问问会是什么原因导致的？应该如何修正？

产量没有在模型中使用，导致模型匹配变量和方程出错。

谢谢解答！。我还想问一下，我现在运行出来显示RHS、Bound和Matrix均出现零值，无法运行出结果。这种情况该怎么解决哇？我应该从哪里下手解决呢？
--- RHS [min, max] : [ 7.970E+01, 5.583E+06] - Zero values observed as well
--- Bound [min, max] : [ 4.462E-05, 2.860E+05] - Zero values observed as well
--- Matrix [min, max] : [ 4.824E-10, 5.415E+07] - Zero values observed as well