Ngspice throws an error: unknown subckt, whenever I try to simulate a circuit in Xschem. There doesn't seem to be any problem with the netlist. Could anyone help me out?

Did you include the spice files of the FETs you are using in xschem?

@Booshan Yes, I have included the

all.spice

file in the

code.sym

block with the schematic

I am not sure about the

all.spice

file. I use something like this within the

code.sym

block, when I use

nfet_01v8

and

pfet_01v8

.

name=TT_model_sky130
format=@value
only_toplevel=true
value="
*.lib ~/open_pdks/sky130/sky130A/libs.tech/ngspice/sky130.lib.spice tt
.param mc_mm_switch=0
.param mc_pr_switch=0
.include ~/open_pdks/sky130/sky130A/libs.tech/ngspice/corners/tt/nonfet.spice

*model
.include ~/open_pdks/sky130/sky130A/libs.tech/ngspice/all.spice
 
*mosfet
.include ~/open_pdks/sky130/sky130A/libs.ref/sky130_fd_pr/spice/sky130_fd_pr__pfet_01v8__tt.corner.spice
.inclued ~/open_pdks/sky130/sky130A/libs.ref/sky130_fd_pr/spice/sky130_fd_pr__nfet_01v8__tt.corner.spice
*mismatch parameters
.include ~/open_pdks/sky130/sky130A/libs.ref/sky130_fd_pr/spice/sky130_fd_pr__pfet_01v8__mismatch.corner.spice
.include ~/open_pdks/sky130/sky130A/libs.ref/sky130_fd_pr/spice/sky130_fd_pr__nfet_01v8__mismatch.corner.spice"

Thanks a lot, it worked. Apparently, the all.spice file was corrupted during download in my case.