ASM Compile Problem :: Assembly

Hi.

I am trying to compiler my first basic ASM program. I used 16 bits x86 in DOS and used MASM 7.0 (ml.exe) that comes with Visual Studio .NET. Here is the simple code.

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.MODEL SMALL
586 ; Indicates support for Pentium chip.

.STACK 100h

.DATA
NameOut DB 'My name is Kuphryn. Welcome to ASM programming!.', 13, 10, '$'

.CODE
Myname PROC
mov ax, @data
mov dx, ax
mov dx, OFFSET NameOut
mov ah, 9h
int 21h
mov al, 0
mov ah, 4ch
int 21h
Myname ENDP

END Myname
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Here is the errors MASM outputted.

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Assembling: myname.asm
myname.asm(21) : error A2006: undefined symbol : DGROUP
myname.asm(31) : warning A4023: with /coff switch, leading underscore required for start address : Myname
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Does anyone know what the error message indicates?

Thanks,
Kuphryn