Problem with some pdf files when convert

[IlianYotov]

Hello,
I have a problem with some of my pdf files when I try to convert them to png or other image format.
PDF files are created with FPDF, and for example when try to convert pdf with arial font there isn't a problem, but when I change the font, convert doesn't make png files. I dont have access to shell and try to create Imagick object from pdf file.

This is error log file:

[20-Jun-2011 23:37:30] PHP Fatal error: Class 'Imagick' not found in /home/yotoveu7/public_html/test/test_problem.php on line 2
[20-Jun-2011 23:37:49] PHP Fatal error: Uncaught exception 'ImagickException' with message 'no decode delegate for this image format `/tmp/magick-XXxPE1D3'' in /home/yotoveu7/public_html/test/test_problem.php:2
Stack trace:
#0 /home/yotoveu7/public_html/test/test_problem.php(2): Imagick->__construct('problem.pdf')
#1 {main}
thrown in /home/yotoveu7/public_html/test/test_problem.php on line 2

tested in:
Imagick module version: 3.0.1
ImageMagick version: 6.2.8

I think that the problem can be the exotic fonts, but I'm not sure.
Is anyone have an idea what is the problem?

[ustas19]

Provide full script and check that you included all necessary files in php script or you need use autoloading