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I am tring to install the live_agent module. When I go to enable the module, I get the following errors:

Notice: Use of undefined constant DRUPAL_ROOT - assumed 'DRUPAL_ROOT' in /sites/all/modules/live_agent/live_agent.module on line 319

Warning: require_once(DRUPAL_ROOT/includes/errors.inc) [function.require-once]: failed to open stream: No such file or directory in /sites/all/modules/live_agent/live_agent.module on line 319

Fatal error: require_once() [function.require]: Failed opening required 'DRUPAL_ROOT/includes/errors.inc' (include_path='.:/usr/share/pear:/usr/share/php') in /sites/all/modules/live_agent/live_agent.module on line 319

The code causing the error is the following one.

 /* 318 */ function live_agent_buttons_form(&$form_state) {
 /* 319 */   global $base_url;
 /* 320 */ 
 /* 321 */   $settings = new liveagent_Settings();
 /* 322 */   $la_buttons_grid = $settings->getButtonsGridRecordset();
 /* 323 */   $recordset = $la_buttons_grid->toArray();
 /* 324 */ 
             // ...
 /* 373 */ }

Any help on debugging this would be greatly appreciated.

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Hello, and welcome to DA! If you read the code and the error message, you'll see that line 319 is not a require_once as the error message states, so you appear to have pasted the wrong code. Bugs in modules a considered off-topic for this site. – Letharion Feb 25 at 18:59
@Letharion I pasted the code that is at line 319 of the module file. – kiamlaluno♦ Feb 25 at 21:17
Do you have APC enabled? If so, try disabling it temporarily. – MPD♦ Feb 26 at 2:42
@kiamlaluno I see. Well, that combination of code and error message still doesn't seem to make sense to me. :) – Letharion Feb 26 at 7:09
@Letharion The errors seem caused from the autoload function, but I don't know why the error is for that line. – kiamlaluno♦ Feb 26 at 9:00

2 Answers

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Check your settings.php file. You might have either; Set the wrong base url OR maybe you did not set one and this module requires it.

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up vote 0 down vote

The error about the undefined constant DRUPAL_ROOT could be caused from the index.php file that is corrupted, or that is returned corrupted from APC, or similar extension. DRUPAL_ROOT is always defined when Drupal bootstraps.

/**
 * Root directory of Drupal installation.
 */
define('DRUPAL_ROOT', getcwd());

require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
menu_execute_active_handler();

As for why the error message is reported for that module when a function that doesn't contain any reference to the constant is executed, I think that is caused from the autoload function Drupal registers, drupal_autoload_class(), which is trying to load the file containing the class.

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