cscanf; I did everything well, but I get a c6328 error.

I'm a beginner who just started learning coding. After the first class, I got confused during the assignment, so I'm leaving a question like this.

#include <stdio.h>
int main(void)
{
char str[300];
    printf("enter your password: ");
    scanf_s("%s", str, sizeof(str));
    printf("your password:  %s\n", str);

return o;
}

There seems to be no problem, but the green wave of the error mark keeps popping up on the scanf side.

And from the list below --> *C6328 size mismatch: 'unsigned_int64' passed to _Param(3) 'unsigned int' is required for the next call. 'scanf_s'. **

The phrase keeps popping up. And the debugs keep failing.

Is there any solution?