Installation Problem event-commerce-wp-event-calendar

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1

Message from bought wp application
event-commerce-wp-event-calendar

Fatal error: Cannot redeclare add_admin_additional_script()
(previously declared in
/var/www/vhosts/intergnosis.eu/httpdocs/wp-content/plugins/event-commerce-wp-event-calendar/evntgen-scbooking.php:754)
in /var/www/vhosts/intergnosis.eu/httpdocs/wp-content/plugins/evnt-scbooking/evnt-scbooking.php on line 758

what i must do to fix it…?

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Is this a application or a plugin you purchased from Envato Market? In which case, please contact the plugin author through the product page for support.