FileChucker: load_prefs():
In order to use the human-test feature, you must enable one of the following settings:
$PREF{try_to_use_imagemagick_for_humantest}
$PREF{try_to_use_gd_for_humantest}
$PREF{try_to_use_convert_for_humantest}
You must also have either the ImageMagick Perl module installed
(it is not currently installed),
or the GD and GD::Simple Perl modules installed
(they are not currently installed),
or you must have ImageMagick's "convert" program available and set $PREF{convert_command} to its path.