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Fatal error: Allowed memory size of X bytes exhausted (tried to allocate Y bytes)…

That indicates that Drupal needed more memory than PHP was allowed to give it.

Increased PHP’s memory limit by adding line:

ini_set(‘memory_limit’, ‘48M’);

in the sites/default/settings.php file

Source: http://drupal.org/node/76156

How to handle the error message “Certificate Error – Contact the application supplier” during installation

In case you receive the error message “Certificate Error – Contact the application supplier” during the installation process of any application.

Please go to Menu → Tools → App. Manager → Options → Settings → Software installation – and change it to “All”.