Error creation extension for extension-point org.eclipse.php.internal.debug.daemon.communication Plug-in org.eclipse.php.debug.core was unable to load class org.eclipse.php.internal.debug.core.zend.communication.DebuggerCommunicationDaemon

This is surely a bug, but you can avoid it in a simple way:

• When you start eclipse, the open/active file must be a PHP file (not css, html, and so on)
• Be sure to not have the breakpoint view as the current view at start