Unrecognized rule with flex ? ! !

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Flex

I tried the code below but each time I have an error "unrecognized rule" at line 24 just after return 1

Thank you for your help

What I have tried:

%option noyywrap

%{
#include<stdio.h>
%}
lettre [a-z]
chiffre [0-9]
variable {lettre}.{chiffre}

%%
"main()" {printf ("<%s, c est la fonction main \n");}
"{"|"}" {printf ("cest les accolades \n");}
"const"{variable} {printf ("cest une constant et leur nom \n");}
"int" {variable} printf ("cest variable et leur nom\n");}
[-+*/= ()] {printf ("cest les opérations arithmétiques \n");}
[ ,] {printf ("cest les seperateurs\n");}
[^\n]
.+ {printf("erreur ! ")}
%%
int yywrap()
{

return 1;
}
int main()
{
int yylex();
}