redefined error asm in assembly programming

Question

I am learning assembly coding, here's my code of Greatest common divisor (GCD), after trying to compile the code, it gives this error :
error: symbol 'etq1' redefined
error: symbol 'etq2' redefined

segment .data        
    r db 0     
segment .bss   
segment .text   
global _main  
extern _printf  
_main:   
    mov al,[200]  
    mov bl,[201]  
etq1:   cmp al,bl   
    jb fin   
etq2:   call PGCD   
    mov [202],bl    
fin:   
ret   

and heres's the call function ;

function
    PGCD:     
        mov [r],al      
    reste:  cmp [r],bl      
        jb etq1       
        sub [r],bl      
    etq1:   cmp [r],0       
        jne etq2           
    etq2:   mov al, bl      
        mov bl,[r]        
        jmp PGCD      
    ret  

Answer 1

All the labels in your asm source are global. Local labels (those which have smaller scope of visibility) are usually have special syntax. For example nasm

gives special treatment to symbols beginning with a period. A label beginning with a single period is treated as a local label, which means that it is associated with the previous non-local label.

ARM asm allows numeric labels, etc. You have to read documentation on your assembly program to find out specific syntax.