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Error when Drupal 8 class file is misplaced

The error is pretty straightforward but the sheer confusion of where to place class files in your module (first off, yes, they do go in your module) might make this a pretty commonly googled error.

Drupal may give an error like this:

Error
The website has encountered an error. Please try again later.

Look in your logs for more detail:

tail -f -n100 /var/log/apache2/error.log

Here's the key problem:

PHP warning Unable to load dynamic library sqlite.so

Getting this every time i run Drush or anything else PHP on the command line:

PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20090626/sqlite.so' - /usr/lib/php5/20090626/sqlite.so: cannot open shared object file: No such file or directory in Unknown on line 0

Fix:

sudo rm /etc/php5/conf.d/sqlite.ini

To find out what is making a cron run very long (or failing)

A bunch of functions run when cron is run, to find out what is causing the overall run to take a long time (possibly timing out and breaking), you need to look at them piece by piece. This code does that:

http://drupal.org/project/drush_debug_tools

Code courtesy Tim Hilliard and tip courtesy George Cassie.

Internal error from Redmine turns out to be due to tmp directory being full

This helpful error:

Internal error An error occurred on the page you were trying to access. If you continue to experience problems please contact your redMine administrator for assistance.

When looked into the logs:

sudo tail -f /var/log/redmine/default/production.log

Too many connections in lock_may_be_available() on Drupal 7 site

Encountered this error:

The website encountered an unexpected error. Please try again later.
Error messagePDOException: SQLSTATE[08004] [1040] Too many connections in lock_may_be_available() (line 165 of /var/local/drupal/dgd7/drupal/includes/lock.inc)

The website encountered an unexpected error. Please try again later PDOException Too many connections in lock_may_be_available() lock.inc

Manually setting up fcgi wrapper permissions

ssh [email protected]
vi /home/members/agariclabs/sites/agaric.com/.red/apache2/apache.conf

Add these two lines inside the VirtualDirectory:

        FCGIWrapper /home/members/agariclabs/sites/agaric.com/bin/php-cgi .php
        SuexecUserGroup agaric agaric

Then copy the bin directory with php-cgi in it from another project and set the permissions to the same user group defined there.

Failure of a large form (by Drupal module Bubbletimer) to submit, Suhosin post max variables error in Apache log

I originally posted the problem to the Bubbletimer module issue queue, Unable to save (pressing Save button has no effect).

The error can be seen be seen on the server by looking at the Apache error log:

sudo tail -f /var/log/apache2/error.log

Try to submit the 20 activity form, and nothing happens on the Drupal /bubbletimer page, but this error shows up in the log:

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