求高手教教小弟。。。请教一个RADASM问题，小弟新人

代码。。

           stack1 segment stack
            db 256 dup(?)
            stack1 ends
            data1 segment
            msg db 'hello world.$'
            data1 ends
            code1 segment
            assume cs:code1,ds:data1
            start :
                   mov ax,data1
                   mov ds,ax
                   mov dx,offset msg
                   mov ah,9
                   int 21h
                   mov ax,4c00h
                   int 21h
            code1 ends
            end start
错误
E:\RadASM\Masm32\Bin\ML.EXE /c /Cp /nologo /I"E:\RadASM\Masm32\Include" "hello.asm"
 Assembling: hello.asm
E:\RadASM\Masm32\Bin\DOSLNK.EXE hello.obj;

Microsoft (R) Segmented Executable Linker  Version 5.60.339 Dec  5 1994
Copyright (C) Microsoft Corp 1984-1993.  All rights reserved.

LINK : fatal error L1093: hello.obj : object file not found

构建时发生错误.
总共编译时间 219 毫秒