Error message

User error: ImageMagick error 1: convert: memory allocation failed `/var/www/stce/htdocs/sites/default/files/field/image/CH convertio.gif' @ error/gif.c/ReadGIFImage/1303. convert: no images defined `/var/www/stce/htdocs/sites/default/files/styles/medium/public/field/image/CH convertio.gif' @ error/convert.c/ConvertImageCommand/3258. in _imagemagick_convert_exec() (line 519 of /var/www/stce/htdocs/sites/all/modules/imagemagick/imagemagick.module).