If your Drupal cron fails to run then most probably the process is stuck and needs to be fixed manually.
You will have to open the common.inc file in a text editor (for example through cPanel->File Manager). It is located in the includes sub directory of your Drupal root folder. Change the following line from:
$semaphore = variable_get('cron_semaphore', FALSE);
to
$semaphore = FALSE;
After that save the modified file and go to the Reports->Status report page in your Drupal admin area. Run the cron manually. After the successful execution you may revert the changes you made in the common.inc file.
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