Clearly, when using the ‘u’ command in DOSBox, it usually displays the corresponding assembly code for functions and code sections. However, in my case, it’s showing raw byte sequences instead of assembly code

this is my code:
.model small
.stack 100h
.data
chao db ‘helu$’
chui db ‘chao cc$’
endl db 13,10,’$’
.code
start:
main proc
mov ax,@data
mov ds,ax

mov ah,9

lea dx,chao
int 21h
           
lea dx,endl 
int 21h 

lea dx,chui
int 21h

mov ah,4ch
int 21h

main endp
end start

and this is how dosbox display my code:
enter image description here

please help me

i don’t know how to fix it. I reinstalled dosbox, or compared my code with others, but they all had the same problem (before that error happened, I ran them and had no problem)