thumbnails on timeline

I've just installed status.net (on ubuntu 10.04 LTS server) and one thing doesn't work:
thumbnails of images are not generated. I found some errors in logs:

PHP Warning: Division by zero in /var/www/statusnet-1.0.1/lib/mediafile.php on line 145, referer: https://status/user1/all
PHP Warning: imagecreatetruecolor(): Invalid image dimensions in /var/www/statusnet-1.0.1/lib/imagefile.php on line 220, referer: https://status/user1/all
PHP Warning: imagecopyresampled() expects parameter 1 to be resource, boolean given in /var/www/statusnet-1.0.1/lib/imagefile.php on line 243, referer: https://status/user1/all
PHP Warning: imagejpeg() expects parameter 1 to be resource, boolean given in /var/www/statusnet-1.0.1/lib/imagefile.php on line 250, referer: https://status/user1/all
PHP Warning: imagedestroy() expects parameter 1 to be resource, boolean given in /var/www/statusnet-1.0.1/lib/imagefile.php on line 262, referer: https://status/user1/all

Is this problem with installation or status.net?
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