Sometimes you find that the ‘Choose Tickets’ button in the booking popup is linked to your event URL or simply reloads the page. The common problem behind this is any javascript error on the page and as far as Eventer plugin’s generated errors on the single event page, it is related to ‘Stripe’ checkout. It happens when you have enabled Stripe payment option but did not enter the API keys in the available fields. To resolve this you must enter both ‘Publishable’ and ‘Secret’ keys required by Stripe gateway or if the keys are not readily available then disable the ‘Stripe’ payment option.