Friends need help.

I made a security plug-in, but there's a problem.

The plugin / init.php

  securıty_class_eventhand are :: getInstance () -> init ();

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classes / event_handler.php

class SECURITY_CLASS_EventHandler

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I always get the same error:

Error message:

  Fatal error: Class 'SECURITY_CLASS_EventHandler' not found in C: \ Program Files \ Ampps \ www \ oxwall1 \

the same problem I am trying on different oxwal sites is constantly coming out