ADS原理图仿真优化失败，提示无法估算成本，怎么解决？

下面是提示消息：
Simulation Messages
Error detected by hpeesofsim during Nominal Optimization `Optim1'.
    Optimization/Statistics Error: Please check for valid `Expr' field in OptimGoal/YieldSpec item
    Check the following device:
    OptimGoal1
Error detected by hpeesofsim during Nominal Optimization `Optim1'.
    'Optim1[1]': circuit simulation fails.
Error detected by hpeesofsim during Nominal Optimization `Optim1'.
    Optim1[1] can't do cost evaluation.
Error detected by hpeesofsim during Nominal Optimization `Optim1'.
Status / Summary
hpeesofsim (*) 510.shp Jul 22 2019, MINT version 5
    (64-bit windows built: Mon Jul 22, 2019 22:53:59 +0000)
OPTIM Optim1[1] <LX_lib:DA_SmithChartMatch_LX:schematic>  optIter=(0->100)
SP Optim1[1].SP1[0] <LX_lib:DA_SmithChartMatch_LX:schematic>  optIter=0  freq=(1 GHz->2 GHz)
-------------------------------------------------------------------------------
Simulation finished with errors.
-------------------------------------------------------------------------------
Resource usage:
  Total stopwatch time     =     0.38 seconds.
--------------------
Simulation terminated due to error.
--------------------
求大佬帮忙看看！
感谢！

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