ADS直流仿真的时候出现问题

大家好，我做ADS直流仿真的时候出现问题。提示的报告如下。这是怎么回事？怎么解决 ？谢谢！
Simulation / Synthesis Messages
Error detected by hpeesofsim during netlist flattening.
`FSL_TECH_FET_MET.FET1' is an instance of an undefined model `FSLRFPK_METMOS_v1'.
Status / Summary
hpeesofsim (*) 350.500 Feb 19 2009 (built: 02/19/09 22:31:44)
Copyright Agilent Technologies, 1989-2008.
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Simulation terminated due to error.
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