ecoDesign - Failed to find design data with specified top cell name

I have a folder named "seed.enc.dat" file, and my gate level netlist is called "design.v", and its top module is called "SEED_key_sched".

But after I use "ecoDesign ./db/seed.enc.dat SEED_key_sched ./design.v" command, it ran out the error that "Failed to find design data with specified top cell name" . How can I deal with it?

Thank you very much !