Call to a member function bind_param() on a non-object (unable to solve despite research)

Question

$stmt = $mysqli->prepare(\'select Un from member where Lock = ? and Activated = ?\');
$stmt -> bind_param(\"ss\", \'N\', \'Y\');//This line gave the error
$stm         


        

Answer 1

$stmt->bind_param("ss", 'N', 'Y');//This line gave the error 

Here you need to sure about data type in database.