汇编时发生错误

[abcdfe211]

assume cs:code,ds:data,ss:stack
data segment
data1:db 5,-4,0,3,100,-51
data2: db 'y=1',0dh,0ah,'$'
data3: db 'y=0',0dh,0ah,'$'
data4: db 'y=-1',0dh,0ah,'$'
data ends
stack segment
db 100 dup(?)
stack ends
code segment
start: mov ax,data
mov ds,ax
mov ax,stack
mov ss,ax
mov ax,0
mov cx,6
mov bx,offset data1
l: mov al,[bx]
cmp al,0
jge l1
lea dx,data4
l1:jg l2
lea dx,data3
l2: lea dx,data2
mov ah,09h
int 21h
inc bx
loop l
mov ah,4ch
int 21h
code ends
end start

此源文件名为 2.asm 在汇编时发生错误。错误为：
2.asm<3> error A2062: Missing or unreachable CS
2.asm<4> error A2062: Missing or unreachable CS
2.asm<5> error A2062: Missing or unreachable CS
2.asm<6> error A2062: Missing or unreachable CS

谁能告诉我这是什么错误啊

[zara]

把 data1/2/3/4 后面的冒号去掉试试

[dailian13]

code segment
start: mov ax,data
是不是code定义有错