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?".
Not sure why the command is failing for you. You could try posting a stack trace. We did try your command with the latest ImageMagick release, 6.3.0-0, and it worked without complaint.
