In the register.c that located in target/lua dir .

the line18 is：
-> tolua_isusertype(tolua_S,1,"${current_class.class_name}",0,&tolua_err)

then，it generate code:
->tolua_isusertype(tolua_S,1,"ByteStream",0,&tolua_err)

that cause error，because it is the usertype in my spacename: cx.ByteStream

so，fix it to:
tolua_isusertype(tolua_S,1,"${generator.scriptname_from_native($current_class.namespaced_class_name, $current_class.namespace_name)}",0,&tolua_err)

right code:
->tolua_isusertype(tolua_S,1,"cx.ByteStream",0,&tolua_err)