Hello, thnaks for the answers, I'm sorry because I can't no longer test the lisp zeta0.lsp because I was fired after 13 years working there, but definitely that lisp was the cause of the "error: malformed string on input" message, and the mentioned lisp wasn't working as should, his function was moving every single object in Z axis to "0", I guess it's because theres no Filter command in AutoCAD for MAC, but now maybe I never know.