A Permission Denied error may occur when you attempt to install or update either the Beaver Builder plugin or theme. This happens because your server is preventing Beaver Builder from creating directories that are required for Beaver Builder to function correctly. The error may appear like this:
Warning: mkdir() [function.mkdir]: Permission denied in [home]/xxxxx/wp-content/plugins/bb-plugin/classes/class-fl-builder-model.php on line 540
To resolve this issue, contact your web host provider or server administrator and ask them to review your read/write permissions on all directories. For more information on WordPress file permissions, see the WordPress Codex on changing file permissions.