Memory Bot Syntax error

[ha.ho.a]

int CMobList::size()
{
    __asm
	(
		"pushl %%eax\n\t"
		"leal 0x10(%%eax), %%ecx\n\t"
		"movl $0x004E9D50, %%eax\n\t"
		"call *%%eax\n\t"
		"leave\n\t"
		"ret"
	       : : "a"(this) :
    );
    return 0;
}

I get a Syntax error C2059 when compiling this code,,, it suggest to change the ": :" but i dont see anything wrong there ,,, sorry for my noobness

[teroareboss1]

try..
"ret"
: : "a"(this) : "%ecx"