Add Calibri Error

[JURALOVE]

Hello Friends

I have a problem with Calibri Font. I added to my FPDF, in font's folder (files php and .z), but when I try to call from my PHP file ... the font isn't found.

I pasted the error:

Stack trace:
#0 /home/tempevinex/public_html/aaa/fpdf/fpdf.php(1142): FPDF->Error('Incorrect font ...')
#1 /home/tempevinex/public_html/aaa/fpdf/fpdf.php(459): FPDF->_loadfont('../../../../fpd...')
#2 /home/tempevinex/public_html/aaa/main/accounts/seerecord/letters/pdf.php(68): FPDF>AddFont('Calibri', '', '../../../../fpd...')

I called to Font in these sentences:

$this->AddFont('Calibri','','../../../../fpdf/font/calibri.php');
$this->SetFont('Calibri','B',20);

Perhaps someone knows my problem and help me.

Thank you for your time and suggestions