Some Googling turned op a Debian bug-report where practically the same error message was reported (ImageMagick was used while building some package). It was also reported fixed in ImageMagick version 5.4.3. The ImageMagick project page shows that the latest version is 5.5.6.

Probably your provider has installed an old (almost a year) version of ImageMagick. I'm afraid the only you can do is persuade your provider to install a newer version of the libraries.

Arjen