CDF for NOT GATE

Hi everyone,

i have a problem when i create CDF parameter for not gate.

this is error "ERROR (SFE-1997): "input.scs" 16: ND0.M2: parameter `w': Unknown parameter name `WP' found in expression"

i change paramter of pmos: width: [@WP:%:2u],length: [@LP:%:0.35u], same for nmos

and then i go to Tool/CDF/edit--> add CDF parameter

but when i finish, it show a warning like this:

"Warning: Warning: ams.env

Fatal: Error loading environment variables from environment file.

Terminating execution."

can you help me how to fix it? did i do wrong step to make CDF parameter?

Thank you so much.