汇编中出现expected:instruction or directive问题怎么办，哪位高手帮忙解决下

data   segment
string db 'where there is a will,there is way.$'
count db ?
data   ends
code   segment
assume ds:data,cs:code
start: push ds
       sub ax,ax
       push ax
       mov ax,data
       mov ds,ax
       mov dx,0
begin: mov bx,offset string
       mov al,[bx]
       cmp al,24h
       jz fin
       cmp al,20h
       jnz next
       inc dx
next:  inc bx
       jmp begin
fin:   count,dx    ；汇编时提示这行出现expected:instruction or directive问题
code   ends
end    start      
提前先谢谢大家了