General Support: Error message on installation

I did a search and found some similar errors (including the fix on line 75 of plog-functions.php, which didn't work) but can't get this fixed.

Can anyone help?

This is the error:

Failed: $AvailableImageOutputFormats = array(text;wbmp;gif;png;jpeg) in file "phpthumb.class.php" on line 519 $this->thumbnailFormat set to $this->config_output_format "jpeg" in file "phpthumb.class.php" on line 529 $this->thumbnailFormat staying as "jpeg" because "" ($this->f) is not in $AvailableImageOutputFormats in file "phpthumb.class.php" on line 539 $this->thumbnailQuality set to "75" in file "phpthumb.class.php" on line 546 $this->config_cache_directory () is not a directory in file "phpthumb.class.php" on line 587 SetCacheFilename() failed because $this->config_cache_directory is empty in file "phpthumb.class.php" on line 1815 exif_thumbnail() does not exist, cannot extract EXIF thumbnail in file "phpthumb.class.php" on line 1735 EXIF thumbnail extraction: (size=0; type=; x) in file "phpthumb.class.php" on line 1739 starting SourceImageToGD() in file "phpthumb.class.php" on line 1886 Not using EXIF thumbnail data because $this->config_use_exif_thumbnail_for_speed is FALSE in file "phpthumb.class.php" on line 1889 Calling ImageCreateFromJPEG(/home/xxxxxx/photos/uploads/DSC00098.JPG) in file "phpthumb.class.php" on line 1960 ImageCreateFromJPEG() was attempted but FAILED in file "phpthumb.class.php" on line 2001 Populating $this->rawImageData and attempting ImageCreateFromStringReplacement() in file "phpthumb.class.php" on line 2004 $this->gdimg_source is still empty in file "phpthumb.class.php" on line 2027 ImageMagickThumbnailToGD() aborting because cannot find convert in $this->config_imagemagick_path (), and `which convert` returned (/usr/bin/convert) in file "phpthumb.class.php" on line 707 ImageMagickThumbnailToGD() aborting because ImageMagickCommandlineBase() failed in file "phpthumb.class.php" on line 782 ImageMagickThumbnailToGD() failed in file "phpthumb.class.php" on line 2036 phpThumb() v1.6.0-200507180958 All attempts to create GD image source failed (source image probably corrupt), cannot generate thumbnail phpThumb() v1.6.0-200507180958 Unknown image type identified by "����" ( 0xff 0xd8 0xff 0xe1) in SourceImageToGD()