Cadence has a built-in SPICE reader. If you are using the Analog Environment, simply go to Setup-Environment and set the SPICE Netlist Reader option to yes. If you are using the command line, refer to the spectre user's guide. Hope that helps.
I have also proble with spp command :cry. I have described errors in this topic: . Has anyone answer or solution for this problem?
Thank you very much.