Error: Unhandled Exception on Generate Cover Plugin

Has anyone seen this error, if so, can it be corrected?

Thanks


calibre, version 0.9.7
ERROR: Unhandled exception: <b>Exception</b>:no decode delegate for this image format `' @ error/blob.c/BlobToImage/360

Traceback (most recent call last):
File "calibre_plugins.generate_cover.action", line 60, in _generate_cover
File "calibre_plugins.generate_cover.dialogs", line 1281, in __init__
File "calibre_plugins.generate_cover.dialogs", line 1529, in display_preview
File "calibre_plugins.generate_cover.draw", line 282, in generate_cover_for_book
File "calibre_plugins.generate_cover.draw", line 163, in create_cover_page
File "site-packages\calibre\utils\magick\__init__.py", line 149, in open
File "site-packages\calibre\utils\magick\__init__.py", line 132, in load
Exception: no decode delegate for this image format `' @ error/blob.c/BlobToImage/360