Signtrue problem when accept PIREP (5.5)

good day all,

when accept PIREP or reset signtrue,

the phpvms show error:

Warning: imagecreatefromstring(): Empty string or invalid image in /xxx/phpvms/core/common/PilotData.class.php on line 1016

,

on PilotData.class.php on line 1016:

$rankimg = imagecreatefromstring($rankimg);

how can i fix?

Is the path to the rank image valid?

Are you using a relative or absolute path to the image, I want to say that it has to be an absolute path for it to work right.