Error on CiviCRM Activation. Can't Install CiviCRM

Question

I’m trying to install a new copy of CiviCRM for Wordpress on Plesk Onyx. I get the following error when I try to activate CiviCRM after uploading the files to my server:

Warning: require_once(CRM/Core/ClassLoader.php): failed to open stream: No such file or directory in /var/www/vhosts/ruinsideca.org/infoportal.ruinsideca.org/wp-content/plugins/civicrm/civicrm.php on line 877

Fatal error: require_once(): Failed opening required 'CRM/Core/ClassLoader.php' (include_path='.:/opt/plesk/php/7.2/share/pear') in /var/www/vhosts/ruinsideca.org/infoportal.ruinsideca.org/wp-content/plugins/civicrm/civicrm.php on line 877

I don’t know why this error is happening or how to fix it. I’ve never come across something like this before. As a result, I can't even install CiviCRM on my server.

I'm running PHP 7.2.22, Wordpress 5.2.3, and CiviCRM 5.17.3.

Thanks for your help

Aidan · Answer

I encountered similar error messages attempting to activate CiviCRM 5.28.0 (but not on Plesk).
The error in that situation was caused by a previous, failed installation attempt on the site this one had been cloned from.  Removing all CiviCRM files and tables then enabled the plugin to be activated correctly.

r4zoli · Answer

Same happened to me. On installing new test CiviCRM under WordPress. The "CiviCRM Contribution Page Widget" plugin caused same error. Civi 5.27.1, WP 5.4.2,  php 7.2.24 on ubuntu 20.04 LTS

Error on CiviCRM Activation. Can't Install CiviCRM

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