Thumbnail generation unsuccessful

• DEBUG post_id=26
• DEBUG Found YAPB image
• DEBUG w=450
• DEBUG q=70
• 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(/wp-content/uploads/2010/07/MG_8061.jpg) set $this->sourceFilename to "/wp-content/uploads/2010/07/MG_8061.jpg" 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: ImageMagickThumbnailToGD() aborting because cannot find convert in $this->config_imagemagick_path (), and `which convert` returned (which: no convert in (/usr/local/bin:/usr/bin:/bin)) in file "phpthumb.class.php" on line 1135
• 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 "70" in file "phpthumb.class.php" on line 916
• DEBUG phpThumb: ResolveFilenameToAbsolute() prepending $this->config_document_root (/var/www/vhosts/boylang.nl/httpdocs) to $filename (/wp-content/uploads/2010/07/MG_8061.jpg) resulting in ($AbsoluteFilename = "/var/www/vhosts/boylang.nl/httpdocs/wp-content/uploads/2010/07/MG_8061.jpg") in file "phpthumb.class.php" on line 1029
• DEBUG phpThumb: $this->sourceFilename set to "/var/www/vhosts/boylang.nl/httpdocs/wp-content/uploads/2010/07/MG_8061.jpg" in file "phpthumb.class.php" on line 817
• 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: GetImageSize(/var/www/vhosts/boylang.nl/httpdocs/wp-content/uploads/2010/07/MG_8061.jpg) says image is 2588x3888 in file "phpthumb.class.php" on line 2930
• DEBUG phpThumb: $this->useRawIMoutput=true after checking $UnAllowedParameters in file "phpthumb.class.php" on line 1252
• DEBUG phpThumb: ImageMagickThumbnailToGD() aborting because ImageMagickCommandlineBase() failed in file "phpthumb.class.php" on line 1891
• DEBUG phpThumb: ImageMagickThumbnailToGD() failed in file "phpthumb.class.php" on line 2966
• DEBUG phpThumb: SetOrientationDependantWidthHeight() starting with "2588"x"3888" in file "phpthumb.class.php" on line 2899
• DEBUG phpThumb: SetOrientationDependantWidthHeight() setting w="450", h="0" in file "phpthumb.class.php" on line 2915
• DEBUG phpThumb: EXIF thumbnail extraction: (size=4826; type="2"; 106x160) in file "phpthumb.class.php" on line 3015
• DEBUG phpThumb: image is 2588x3888 and therefore contains more pixels (10062144) than $this->config_max_source_pixels setting (6710886) in file "phpthumb.class.php" on line 3057
• 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 ImageMagickCommandlineBase() failed in file "phpthumb.class.php" on line 1891
• DEBUG phpThumb: Not using EXIF thumbnail data because $this->config_use_exif_thumbnail_for_speed is FALSE in file "phpthumb.class.php" on line 3341
• 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 All attempts to create GD image source failed. ImageMagick is not installed (it is highly recommended that you install it). Source image is too large (2588x3888 = 10.1Mpx, max=6.7Mpx) for GD creation (either install ImageMagick or increase PHP memory_limit to at least 64M). in file "phpthumb.class.php" on line 3709
• DEBUG phpThumb: phpThumb() v1.7.9-200805132119 Image (JPEG) is too large for PHP-GD memory_limit, please install ImageMagick or increase php.ini memory_limit setting in file "phpthumb.class.php" on line 3709
• DEBUG phpThumb: SourceImageToGD() failed in file "phpthumb.class.php" on line 323