Getting --cores error...

[Jokendo-collab]

I keep on getting the error below even after specifying --cores . How can I go around this?

python Bellerophon.py -o temp/ -l All_R1_1000.fastq -r All_R2_1000.fastq -a Demo.fasta
Error: you need to specify the maximum number of CPU cores to be used at the same time. If you want to use N cores, say --cores N or -cN. For all cores on your system (be sure that this is appropriate) use --cores all. For no parallelization use --cores 1 or -c1.