how to use command "glift"

[kk-attention]

I have used follow script:
//
#!/usr/bin/env yosys
read -sv demo.v
hierarchy -top demo
proc
opt
techmap
glift -create-precise-model
//
report error:
ERROR:Assert sig.is_wire() \\ sig.is_fully_const() faided in passes/cmd/glift.cc: 46