(module-name matrix) (define-simple-class matrix () (v ::vector init-keyword: v:) ((*init* (vParam ::vector)) (set! v vParam)) ) (require matrix) /Users/mattei/Library/CloudStorage/Dropbox/git/AI_Deep_Learning/kawa/matrix.scm:12:6: invalid argument list for slot 'v' args:null what is wrong with that?