Problem with FPDF

Good day Mr. Moderator,
Please I'm having problem displaying database data in my fpdf. I created the pdf document using fpdf and everything about that is working fine. The challenge now arise from here:
I have a class called JobCardManager which manages the jobcard. Anytime I want to create a pdf format of the job card from my database, i make this call shown below when Print JC button is clicked on a web form:

//Print out the Job Card
elseif(isset($_POST['action']) && $_POST['action'] == 'Print JC')
{
	$results['jobcards'] = JobCardManager::getJobCardById( (int)$_POST['id'] );
    
    $action = 'printJobCard';
	$id = $results['jobcards']->id;
	$repairId = $results['jobcards']->repairId;
	$openDate = $results['jobcards']->openDate;
	$openTime = $results['jobcards']->openTime;
	$repairTime = $results['jobcards']->repairTime;
	$repairOrderType = $results['jobcards']->repairOrderType;
	$section = $results['jobcards']->section;
	$pryRepairOrderNo = $results['jobcards']->pryRepairOrderNo;
	$preparedBy = $results['jobcards']->preparedBy;
	$promDelDate = $results['jobcards']->promDelDate;
	$promDelTime = $results['jobcards']->promDelTime;
	$revisedDelDate = $results['jobcards']->revisedDelDate;
	$revisedDelTime = $results['jobcards']->revisedDelTime;
	$kmIn = $results['jobcards']->kmIn;
	$kmOut = $results['jobcards']->kmOut;
	$mt = $results['jobcards']->mt;
	$at = $results['jobcards']->at;
	$estimateRef = $results['jobcards']->estimateRef;
	$contractorCustomer = $results['jobcards']->contractorCustomer;
	$splPackage = $results['jobcards']->splPackage;
	$estimateDate = $results['jobcards']->estimateDate;
	$others = $results['jobcards']->others;
	$lubServices = $results['jobcards']->lubServices;
	$noj1 = $results['jobcards']->noj1;
	$noj2 = $results['jobcards']->noj2;
	$noj3 = $results['jobcards']->noj3;
	$noj4 = $results['jobcards']->noj4;
	$noj5 = $results['jobcards']->noj5;
	$noj6 = $results['jobcards']->noj6;
	$noj7 = $results['jobcards']->noj7;
	$noj8 = $results['jobcards']->noj8;
	$noj9 = $results['jobcards']->noj9;
	$noj10 = $results['jobcards']->noj10;
	$opCode1 = $results['jobcards']->opCode1;
	$opCode2 = $results['jobcards']->opCode2;
	$opCode3 = $results['jobcards']->opCode3;
	$opCode4 = $results['jobcards']->opCode4;
	$opCode5 = $results['jobcards']->opCode5;
	$opCode6 = $results['jobcards']->opCode6;
	$opCode7 = $results['jobcards']->opCode7;
	$opCode8 = $results['jobcards']->opCode8;
	$opCode9 = $results['jobcards']->opCode9;
	$opCode10 = $results['jobcards']->opCode10;
	$rco1 = $results['jobcards']->rco1;
	$rco2 = $results['jobcards']->rco2;
	$rco3 = $results['jobcards']->rco3;
	$rco4 = $results['jobcards']->rco4;
	$rco5 = $results['jobcards']->rco5;
	$rco6 = $results['jobcards']->rco6;
	$rco7 = $results['jobcards']->rco7;
	$rco8 = $results['jobcards']->rco8;
	$rco9 = $results['jobcards']->rco9;
	$rco10 = $results['jobcards']->rco10;
	$labour = $results['jobcards']->labour;
	$parts = $results['jobcards']->parts;
	$tba = $results['jobcards']->tba;
	$gasAndOil = $results['jobcards']->gasAndOil;
	$sublet = $results['jobcards']->sublet;
	$others2 = $results['jobcards']->others2;
	$total = $results['jobcards']->total;
	$discountLabour = $results['jobcards']->discountLabour;
	$discountParts = $results['jobcards']->discountParts;
	$services = $results['jobcards']->services;
	$others = $results['jobcards']->others;
	$lubServices = $results['jobcards']->lubServices;
	$warrantyLabour = $results['jobcards']->warrantyLabour;
	$warrantyParts = $results['jobcards']->warrantyParts;
	$vat = $results['jobcards']->vat;
	$netAmountPayable = $results['jobcards']->netAmountPayable;
	
	  include 'pdf.php';
      exit();
  
}

The Print JC button actually calls this code from the JobCardManager class:

public static function getJobCardById( $id ) {
		$conn = DatabaseManager::getConnection();
		$sql = "SELECT *, UNIX_TIMESTAMP(openDate) AS openDate, UNIX_TIMESTAMP(promDelDate) AS promDelDate, UNIX_TIMESTAMP(revisedDelDate) AS revisedDelDate, UNIX_TIMESTAMP(estimateDate) AS estimateDate FROM jobcard WHERE id = :id";
		$st = $conn->prepare( $sql );
		$st->bindValue( ":id", $id, PDO::PARAM_INT );
		$st->execute();
		$row = $st->fetch();
		$conn = null;
		if ( $row ) return new JobCardManager( $row );
	}

My generated pdf is working fine when I display normal data embedded in it directly but when I tried to output the value of $openDate inside it, it gave me this error:

Notice: Undefined variable: openDate in C:\wamp\www\me\customers\pdf.php on line 32

I tried to output the database data called when Print JC is pressed in another html/php page and it displayed my data rightly. What am I doing wrong with this fpdf doc? thanks in advance.

Thanks all, i have this problem sorted out.