求助，shell下db.create("root","admin")报错：
root@sdbserver1:/opt/sequoiadb/bin# ./sdb
Welcome to SequoiaDB shell!
help() for help, Ctrl+c or quit to exit
> var db=new Sdb()
Takes 0.2546s.
> db.createUsr("root","admin")
(nofile):0 uncaught exception: -6
Invalid Argument
Takes 0.1012s.
