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I am running a Drupal Commerce Kickstart 1 on top of it (D7)site on localhost/xampp (1.7.7).

Now: When I go to Content Type (/admin/structure/type), and click Edit on a given type or New Content Type, i get the white screen or a server 500 error. I can access manage fields and manage display on the same page. When I go to drupal error logs, there is no trace of the error. Neither can I find a trace of the problem in /opt/lampp/log/error_log. Tried to increase allowef script time / php memory limit in php.ini - no result.

The site works without problems on a remote testing server, and has been working without problems for a long time locally. So most probably it's local configuration, but I am not sure what to do.

Maybe some of you have an idea about what can I do?

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  • PHP Fatal Error should be logging to syslog. Have you checked there?
    – Triskelion
    Commented Mar 13, 2013 at 18:45
  • when I do 'tail /opt/lampp/log/error_log' just after generating this error, I get '[Wed Mar 13 18:31:00 2013] [error] [client 127.0.0.1] PHP Fatal error: require_once() [<a href='function.require'>function.require</a>]: Failed opening required '/opt/lampp/htdocs/woo/profiles/commerce_kickstart/modules/rules/includes/rules.core.inc' (include_path='.:/opt/lampp/lib/php') in /opt/lampp/htdocs/woo/includes/bootstrap.inc on line 3066' - that is, only one such error from more then an hour ago (during which i retried it many times with cache clearing, php memory etc).
    – Dalmaz
    Commented Mar 13, 2013 at 18:52
  • Is the rules.core.inc file missing? If it is present, does the web server have permission to read and execute?
    – Triskelion
    Commented Mar 13, 2013 at 19:52
  • In fact, everything is OK with that file. It's just an error message form another drupal install on the same xampp, in which i tried to replicate the install that was (and still is) working on the remote server. The error reappered, and I tried to move the modules to standard location /sites/all/modules, so at fires the system failed to find the file. Still, there is no trace of any error anor 500 message (which were plenty
    – Dalmaz
    Commented Mar 13, 2013 at 23:21
  • 'dmesg |grip PHP' gives an empty list. I'm not using an lampp installed from ubuntu repositories, but a tar.gz extracted to /opt/lampp/. Maybe that version has some pecularities, I'll try the Ubuntu one.
    – Dalmaz
    Commented Mar 13, 2013 at 23:28

1 Answer 1

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OK, resolved. Thanks for your help, Triskelion - thanks to you, I understand xampp better. There were two things 1) xampp giving no error messages. After looking in vain for error messages, I upgraded to xampp 1.8.0, and when I tried to get to the page that caused problems, I got a full error message. 

 Additional uncaught exception thrown while handling exception.Original ODOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT * FROM {system} WHERE type = &#039;theme&#039; OR (type = &#039;module&#039; AND status = 1) ORDER BY weight ASC, name ASC; Array ( ) in system_list() (line 165 of /opt/lampp/htdocs/twotrees/includes/module.inc). Additional 
PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT ff.* FROM {filter_format} ff WHERE (status = :db_condition_placeholder_0) ORDER BY weight ASC; Array ( [:db_condition_placeholder_0] =&gt; 1 ) in filter_formats() (line 409 of /opt/lampp/htdocs/twotrees/modules/filter/filter.module).
Uncaught exception thrown in session handler.
PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away in _drupal_session_write() (line 209 of /opt/lampp/htdocs/twotrees/includes/session.inc).

Still, no messages in error_log. Where should I look for them?

2) I searched through the web, and found similar problems for example [http://drupal.org/node/1542432]. It turned out this is a XAMPP mysql memomry limit problem. I changed the value 'max_allowed_packet' to 100M in 'my.cnf'.

My site works now. I was really scared!

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