My PDO class returns Error on Execution - function

Question

I finished transitioning to PDO and am modifying my system according to fatal errors that pop up.
ERR: Call to a member function execute() on a non-object in /home/a1933806/public_html/globals/server-bin/php/core.php
LINE: 43
This is my setup with affected line in bold:
class netCore {
private $armor;
private $boot;
private $dbHost = "*****.*******.com";
private $dbNAME = "********";
private $dbPASS = "********";
private $dbUSR = "********";
private $err;
private $state;
public function __construct() {
$bootloadr = "mysql:host=".$this->dbHost.";dbname=".$this->dbNAME.";charset=UTF8";
$opt = array(PDO::ATTR_PERSISTENT => true, PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION);
try {
$this->boot = new PDO($bootloadr, $this->dbUSR, $this->dbPASS, $opt);
} catch(PDOException $e) {
$this->err = "<b>Lebensborn® netCore™ Error:</b> An exception has been raised during Network-to-Database procedures.<br /><b>Message:</b> ".$e->getMessage().".";
}
}
public function bind($param, $value, $type = null) {
if(is_null($type)) {
switch(true) {
case is_int($value):
$type = PDO::PARAM_INT;
break;
case is_bool($value):
$type = PDO::PARAM_BOOL;
break;
case is_null($value):
$type = PDO::PARAM_NULL;
break;
default:
$type = PDO::PARAM_STR;
}
}
$this->state->bindValue($param, $value, $type);
}
public function exe() {
return $this->state->execute();
}
public function count() {
return $this->state->rowCount();
}
public function q($q) {
try {
$this->armor = $this->boot->prepare($q);
$this->state = $armor;
} catch(PDOException $e) {
$this->err = "<b>Lebensborn® netCore™ Error:</b> An exception has been raised during Network-to-Database procedures.<br /><b>Message:</b> ".$e->getMessage().".";
}
}
public function set() {
$this->exe();
return $this->state->fetchAll(PDO::FETCH_ASSOC);
}
public function single() {
$this->exe();
return $this->state->fetch(PDO::FETCH_ASSOC);
}
public function transBegin() {
return $this->boot->beginTransaction();
}
public function transCancel() {
return $this->boot->rollBack();
}
public function transEnd() {
return $this->boot->commit();
}
}