ImagickException – cache resources exhausted
It says i all. Increase the memory limits for Imagick and you should be fine.
However, it does not help to just add more memory in
php.ini, instead you have a
policy.xml where Imagick has it’s own settings.
If you are in an Linux environment you should find Imagick’s configurations in
<policy domain="resource" name="memory" value="1Gib"/>
<policy domain="resource" name="disk" value="2GiB"/>
and try tweaking does for your needs.