strobe period in tran dynamic parameter

Hi,

I try to use strobeperiod as a dynamic parameter in transient simulation. But the sim log says: 

ERROR (SPECTRE-16557): In analysis 'tran', the parameter 'strobeperiod' defined in `paramSet1tran` paramset is not found in the netlist.

Is there any clue to include the strobeperiod in the dynamic parameter?

My cadenc version is IC618-64b.500.18, and mmsim version is 19.10.322. 

BR