Answers.Body: <p>This is highly due to one of the custom extension enabled on your site. Few steps you could try to fix this -</p>
  
  <ul>
  <li>Check if any of the extension overrides the file <code>CRM/Core/Config.php</code>. If you find it, move it outside the site dir and disable that extension after reloading the page.</li>
  <li>Manually disable the extension from the database one by one and try to reload the page. To disable the ext, set <code>is_active</code> value to 0 in <code>civicrm_extension</code> table. (Remember to revert it back if the page reload is still an error).</li>
  <li>Check if the custom php directory overrides the core file CRM/Core/Config.php. If yes, do the same as step 1.</li>
  </ul>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-12T13:22:41.187Z
Answers.Text: Thanks for your answer. I searched for another Config.php in the whole project but didn't find anything. I deactivated all extensions in the db like you said, but it did not changed the error. Actually this errors shows up on the dashboard page also... The debugging shows : CRM_Core_Exception: Cannot read unrecognized property CRM_Core_Config::$defaultSymbol. in /web/pui/wp-content/plugins/files/civicrm/templates_c/fr_FR/%%24/24E/24E27851%%jsortable.tpl.php on line 152
Answers.UserDisplayName: Pierre
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-12T14:38:04.697Z
Answers.Text: Delete everything inside `/web/pui/wp-content/plugins/files/civicrm/templates_c` - they are only cache files.
Answers.UserDisplayName: Christian Wach
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-13T02:46:56.167Z
Answers.Text: Agree with Christian - also try to rebuild the menu by appending this to the base URL - `civicrm/menu/rebuild?reset=1`
Answers.UserDisplayName: jitendra - fuzion
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-12T11:32:37.233Z
Answers.LastActivityDate: 2018-02-12T11:32:37.233Z
Answers.UserDisplayName: jitendra - fuzion
Body: <p>Upgrading seems to work fine, I checked folders and resources configuration because the paths weren't there anymore.
  Then when I try to access the extensions menu I get the following error :</p>
  
  <pre><code>Cannot read unrecognized property CRM_Core_Config::$defaultSymbol.
  </code></pre>
  
  <p>And the extensions list isn't being displayed. I tried turning debugging on but nothing shows</p>
  
Tags: <wordpress><upgrade><4.7><4.6>
Title: WP - Errors after update from 4.6 LTS to 4.7
ThreadText: # WP - Errors after update from 4.6 LTS to 4.7
  
  (Asked by: username_0 on 2018-02-12)
  
  Upgrading seems to work fine, I checked folders and resources configuration because the paths weren't there anymore.
  Then when I try to access the extensions menu I get the following error :
  Cannot read unrecognized property CRM_Core_Config::$defaultSymbol.
  
  And the extensions list isn't being displayed. I tried turning debugging on but nothing shows
  
  **Tags:** wordpress, upgrade, 4.7, 4.6
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2018-02-12. Score: 1
  
  This is highly due to one of the custom extension enabled on your site. Few steps you could try to fix this -
  
  * Check if any of the extension overrides the file `CRM/Core/Config.php`. If you find it, move it outside the site dir and disable that extension after reloading the page.
  * Manually disable the extension from the database one by one and try to reload the page. To disable the ext, set `is_active` value to 0 in `civicrm_extension` table. (Remember to revert it back if the page reload is still an error).
  * Check if the custom php directory overrides the core file CRM/Core/Config.php. If yes, do the same as step 1.
  
  > **Comments:**
  > **username_0**: Thanks for your answer. I searched for another Config.php in the whole project but didn't find anything. I deactivated all extensions in the db like you said, but it did not changed the error. Actually this errors shows up on the dashboard page also... The debugging shows : CRM_Core_Exception: Cannot read unrecognized property CRM_Core_Config::$defaultSymbol. in /web/pui/wp-content/plugins/files/civicrm/templates_c/fr_FR/%%24/24E/24E27851%%jsortable.tpl.php on line 152  
  > **username_2**: Delete everything inside `/web/pui/wp-content/plugins/files/civicrm/templates_c` - they are only cache files.  
  > **username_1**: Agree with Christian - also try to rebuild the menu by appending this to the base URL - `civicrm/menu/rebuild?reset=1`  
  
  ---
  
  