Using online asm compiler on tutorialspoint but can't seem to get it right. Trying to add two numbers $5$ and $10$ but this also getting an error

section $.$data

msg db 'The sum is: $\text{'},0$

section $.$text

global $\_$start

$\_$start:

mov eax, $5$ ; First argument: $5$

mov ebx, $10$ ; Second argument: $10$

call sum

sum:

push ebp ; Function prologue

mov ebp, esp

add eax, ebx ; Add the two arguments

mov eax, $4$ ; Write system call number

mov ebx, $1$ ; File descriptor: stdout

mov ecx, msg ; Message to print

mov edx, $14$ ; Length of message

int $80$h ; Call kernel

mov eax, $4$ ; Write system call number

mov ebx, $1$ ; File descriptor: stdout

mov ecx, eax ; Result to print

add ecx, $48$ ; Convert result to ASCII

mov edx, $1$ ; Length of result

int $80$h ; Call kernel

pop ebp ; Function epilogue

ret

mov eax, $1$ ; Exit system call number

xor ebx, ebx ; Exit status: $0$

int $80$h ; Call kernel