unbound variable - device property issue

Hi,

I set a variable "L350" to NMOS transistor length and sweep the variable. It works well. 

However, after I try parameterization on its length, accidently cds shows the unbound variable issue of "L350", CIW report: CDF parameter function has problem. And when I open property of NMOS transistor by "Q", all CDF info disappear. 

I can forcely open property assistant view, and find many yellow exclamation mark as below. Btw, the netlisting and simulation still work with this issue. 

Is there anyway to recover the CDF settings as before? Thanks!