Thumbnail generation unsuccessful

• DEBUG post_id=879
• DEBUG Found YAPB image
• DEBUG w=180
• ERROR phpThumb couldn't generate thumbnail.
• INFO Writing out phpThumb internal debug messages:
• DEBUG phpThumb: phpThumb() v1.7.9-200805132119 in file "phpthumb.class.php" on line 216
• DEBUG phpThumb: setSourceFilename() set $this->sourceFilename to "" in file "phpthumb.class.php" on line 243
• DEBUG phpThumb: file_exists() = 0 in file "phpthumb.class.php" on line 1105
• DEBUG phpThumb: is_executable() = 0 in file "phpthumb.class.php" on line 1106
• DEBUG phpThumb: using ImageMagick path from `which convert` (/usr/local/bin/convert) in file "phpthumb.class.php" on line 1125
• DEBUG phpThumb: ImageMagick version checked with "convert --version" in file "phpthumb.class.php" on line 1152
• DEBUG phpThumb: ImageMagick convert --version says "Version: ImageMagick 6.3.3 03/08/07 Q16 http:" in file "phpthumb.class.php" on line 1160
• DEBUG phpThumb: Addding ImageMagick formats to $AvailableImageOutputFormats (text;ico;bmp;wbmp;gif;png;jpeg) in file "phpthumb.class.php" on line 882
• DEBUG phpThumb: $AvailableImageOutputFormats = array(text;ico;bmp;wbmp;gif;png;jpeg) in file "phpthumb.class.php" on line 888
• DEBUG phpThumb: $this->thumbnailFormat set to $this->config_output_format "jpeg" in file "phpthumb.class.php" on line 899
• DEBUG phpThumb: $this->thumbnailQuality set to "75" in file "phpthumb.class.php" on line 916
• DEBUG phpThumb: phpThumb() v1.7.9-200805132119 $this->sourceFilename and $this->src are both empty in file "phpthumb.class.php" on line 3709
• DEBUG phpThumb: setCacheDirectory() starting with config_cache_directory = "" in file "phpthumb.class.php" on line 923
• DEBUG phpThumb: $this->config_cache_directory () is not a directory in file "phpthumb.class.php" on line 959
• DEBUG phpThumb: SetCacheFilename() failed because $this->config_cache_directory is empty in file "phpthumb.class.php" on line 3076
• DEBUG phpThumb: starting ExtractEXIFgetImageSize() in file "phpthumb.class.php" on line 2920
• DEBUG phpThumb: skipping GetImageSize() because $this->sourceFilename is empty in file "phpthumb.class.php" on line 2932
• DEBUG phpThumb: GetImageSize("") failed in file "phpthumb.class.php" on line 2959
• DEBUG phpThumb: $this->useRawIMoutput=true after checking $UnAllowedParameters in file "phpthumb.class.php" on line 1252
• DEBUG phpThumb: ImageMagickThumbnailToGD() aborting because $this->sourceFilename is empty in file "phpthumb.class.php" on line 1295
• DEBUG phpThumb: ImageMagickThumbnailToGD() failed in file "phpthumb.class.php" on line 2966
• DEBUG phpThumb: SetOrientationDependantWidthHeight() starting with ""x"" in file "phpthumb.class.php" on line 2899
• DEBUG phpThumb: SetOrientationDependantWidthHeight() setting w="180", h="0" in file "phpthumb.class.php" on line 2915
• DEBUG phpThumb: EXIF thumbnail extraction: (size=0; type=""; 0x0) in file "phpthumb.class.php" on line 3015
• DEBUG phpThumb: starting SourceImageToGD() in file "phpthumb.class.php" on line 3273
• DEBUG phpThumb: $this->useRawIMoutput=true after checking $UnAllowedParameters in file "phpthumb.class.php" on line 1252
• DEBUG phpThumb: ImageMagickThumbnailToGD() aborting because $this->sourceFilename is empty in file "phpthumb.class.php" on line 1295
• DEBUG phpThumb: Not using EXIF thumbnail data because $this->exif_thumbnail_data is empty in file "phpthumb.class.php" on line 3329
• DEBUG phpThumb: $this->gdimg_source is still empty in file "phpthumb.class.php" on line 3381
• DEBUG phpThumb: ImageMagickThumbnailToGD() failed in file "phpthumb.class.php" on line 3383
• DEBUG phpThumb: phpThumb() v1.7.9-200805132119 Unable to create image, neither filename nor image data suppplied in SourceImageToGD() [3490] in file "phpthumb.class.php" on line 3709
• DEBUG phpThumb: SourceImageToGD() failed in file "phpthumb.class.php" on line 323