Use of undefined constant EWPT_PLUGIN_SLUG - assumed 'EWPT_PLUGIN_SLUG' (this will throw an Error in a future version of PHP)

Question

How to fix Use of undefined constant EWPT_PLUGIN_SLUG - assumed \'EWPT_PLUGIN_SLUG\' (this will throw an Error in a future version of PHP) in /home/realmuli/public_html/wp-c