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You are hereQuick out of memory or out of time debugging
By Marko Blažeković - Posted on 29 April 2015
error_reporting(E_ALL); ini_set('display_errors', TRUE); ini_set('display_startup_errors', TRUE); ini_set('memory_limit', ''728M'); ini_set('max_execution_time', 120)
add this to index.php and see what is the output, act on that.