Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
Check environment. Is 'convert' on the comamnnd path. Are you in the right directory, can the web server (which is usally running as nobody or apache) write to the directory or file you are trying to create or update.