Thread:Project:Support desk/MediaWiki 1.20.0: Error creating thumbnail: Shared object "libpcre.so.1" not found, required by "liblqr-1.so.3"

When I upload an image to my wiki, the image is uploaded, but instead of the tumbnail image I get a box with following error message:

Error creating thumbnail: Shared object "libpcre.so.1" not found, required by "liblqr-1.so.3"

The Thumbnails are not available, the folder /images/thumb is empty. This happens with .jpg and .png files. I think, there is something wrong configured or missing, but I don't know if the problem is within the mediawiki package or on the webserver. As I use a webserver offered by a provider, I cannot look that up.

Can someone please tell me how to find out what the problem is and how to solve it?