.png not supported?

zdravim, ladicka mi hlasi chybu:

InvalidArgumentException

NImage is not valid.

Nette/Image.php (104) source NImage->__construct (arguments )

$image

bool(FALSE)
*
Line 103: case self::PNG:
Line 104: return new self(imagecreatefrompng($file));*

vstupny subor je:
presenters/AddPresenter.php (119) source NImage:: fromFile (arguments )

$file

string(61) „/usr/local/www/auto/run/files/1267132943-mesiac-nasa.png“

pricom: $ file /usr/local/www/auto/run/files/1267132943-mesiac-nasa.png

/usr/local/www/auto/run/files/1267132943-mesiac-nasa.png: PNG image, 1098 × 811, 8-bit/color RGB, non-interlaced

ide o bug?

• PHP 5.2.12
• Apache/2.2.14 (FreeBSD) mod_ssl/2.2.14 OpenSSL/0.9.8k DAV/2 PHP/5.2.12 with Suhosin-Patch
• Nette Framework 0.9.3 (revision 2ce0ca6 released on 2010–02–02)