Imagick(ImageMagick for php): why can't read PDF file?

Question

PHP

I'm trying to call readImage(). With images, the library works fine, but when you try to open a PDF file, a white screen appears on the page (no errors are displayed), the html code of the page is completely empty. The only thing that came out in this case was a "naked" test message with "echo" before the line with readimage(). After - no longer works.
I also tried this option: $imagick=new Imagick("file.pdf"); The same.
Given my unprofessionalism and the fact that I'm practically a beginner, there are absolutely no options for solving this problem. Tell me at least where to dig, where to start.

Answer 1

www.imagemagick.org/discourse-server/viewtopic.php...

Answer 2

The first thing to do in case of problems is to look at the logs, in this case, most likely /var/log/apache2/error.log