Conditional analysis error message

Hi, 

I'm trying to run a conditional analysis, using this code:

gcta64 --bfile c1set --cojo-file c1set.ma --cojo-actual-geno --cojo-cond cond.snplist --out test

and am receiving the following error message:

Error: invalid option "--cojo-file"

I can't find any documentation to explain why this might be happening.

Thanks!

Cassy