Warning: pdostatement::execute() [pdostatement.execute]: SQLSTATE[HY093]: invalid parameter number: number of bound variables does not match number of tokens

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PDO

prepare("UPDATE tb set fname=:fname, sname=:sname, lname=:lname, pNo=:pNo, mNo=:mNo, Entry=:Entry, Faculty=:Faculty, Department=:Department, Session_Year:Session_Year, mstatus=:mstatus, gender=:gender, dob=:dob, State=:State, lga=:lga, Address=:Address where pNo= $pNo");
$stmt->bindParam("fname",$fname);
$stmt->bindParam("sname",$sname);
$stmt->bindParam("lname",$lname);
$stmt->bindParam("pNo",$pNo);
$stmt->bindParam("mNo",$mNo);
$stmt->bindParam("Entry",$Entry);
$stmt->bindParam("Faculty",$Faculty);
$stmt->bindParam("Department",$Department);
$stmt->bindParam("Session_Year",$Session_Year);
$stmt->bindParam("mstatus",$mstatus);
$stmt->bindParam("gender",$gender);
$stmt->bindParam("dob",$dob);
$stmt->bindParam("State",$State);
$stmt->bindParam("lga",$lga);
$stmt->bindParam("Address",$Address);
$stmt->execute();
echo "alert('Update Succesfully');";

?>

What I have tried:

I'M try to update my record I'M Doing it Manually please if there is any solution