An InvalidArgumentException was thrown!   code: EspressoTicketSelector - processShortcode - 75
"A valid Event ID is required to use the "ESPRESSO_TICKET_SELECTOR" shortcode.
An Event with an ID of "" could not be found.
Please verify that the shortcode added to this post's content includes an "event_id" argument and that it's value corresponds to a valid Event ID."

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/home/public/sites/www.zeeheldentheater.nl/new/wp-content/plugins/event-espresso-core-reg/core/domain/entities/shortcodes/EspressoTicketSelector.php   ( line no: 75 )