After enabling the wordpress WP Super Cache and the HTML Minifi plugin for the WP Super Cache plugin (That's right, a plugin for a plugin) I get empty pages on /localhost/wp/ (Or https://www.microdevsys.com/wp/) which obviously isn't so good for the readers.  So i download the plugin to my local server LAMP installation and test it there.  Thankfully I get the same results.  (Thankfully because otherwise I'd have a very difficult time debugging this thing through my web host who has limited access.)

/var/log/httpd/error_log
[Fri Nov 30 20:52:13 2012] [warn] Cannot get media type from 'x-mapp-php5'
[Fri Nov 30 20:52:13 2012] [error] [client ::1] PHP Warning:  require_once(/var/www/html/wp/wp-content/plugins/wp-super-cache/plugins/min/lib/Minify/HTML.php): failed to open stream: No such file or directory in /var/www/html/wp/wp-content/plugins/wp-super-cache/plugins/WPSCMin.php on line 125, referer: http://localhost/wp/wp-admin/options-general.php?page=wpsupercache&tab=plugins
[Fri Nov 30 20:52:13 2012] [error] [client ::1] PHP Fatal error:  require_once(): Failed opening required '/var/www/html/wp/wp-content/plugins/wp-super-cache/plugins/min/lib/Minify/HTML.php' (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/html/wp/wp-content/plugins/wp-super-cache/plugins/WPSCMin.php on line 125, referer: http://localhost/wp/wp-admin/options-general.php?page=wpsupercache&tab=plugins
[Fri Nov 30 20:52:13 2012] [error] [client ::1] PHP Fatal error:  Call to a member function get() on a non-object in /var/www/html/wp/wp-includes/cache.php on line 113, referer: http://localhost/wp/wp-admin/options-general.php?page=wpsupercache&tab=plugins
 

And in my /var/log/messages, this one:
localhost – – [30/Nov/2012:20:54:48 -0500] "GET /wp/ HTTP/1.1" 500 – "http://localhost/wp/wp-admin/options-general.php?page=wpsupercache&tab=plugins" "Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.26) Gecko/20120216 Red Hat/3.6.26-1.el6_2 Firefox/3.6.26 AlexaToolbar/alxf-2.17"
 

The first thing we check is of course that the file exists:

which it doesn't.  So we know that the error isn't anything else however the question now is why is it looking for THAT file when the WPSCMin-0.5.zip doesn't have that file:

# unzip WPSCMin-0.5.zip
Archive:  WPSCMin-0.5.zip
   creating: WPSCMin/
  inflating: WPSCMin/WPSCMin-changelog.txt  
  inflating: WPSCMin/WPSCMin.php     
#

Sure enough, no HTML.php as the plugin required unfortunately so the only option I had is to disable WPSCMin for the time being and remove it.

Cheers,
TK