Zend Server 8.0
Z-Ray with ZF2 extension
Zend Server 8.5
When loading Zend Framework 2 application with closure, you might get this exception when Z-Ray is loaded. See more details on the reported bug:
You can disable Z-Ray or rename the zray.php in the ZF2 extension (now called "plugins").
Upgrade to Zend Server 8.5 and up to completely resolve the issue and use Z-Ray and ZF2 plugin.