Hi Flavien,
Thanks so much for getting in touch–I’m so sorry to hear that you’re having some trouble with your Event Tickets install. I’m afraid that we’re not equipped to provide technical support for current plugin users here in our pre-sales forum. For users of our free plugins such as The Events Calendar and Event Tickets, we’re happy to provide assistance on the WordPress.org support forum for the affected product. Would you mind taking a moment to reach out to us there with a new thread? One of our support team members will follow up to begin troubleshooting with you just as soon as possible!
If you can, please take the time to confirm in your post that you’ve run through our conflict testing steps prior to contacting us–this will save us a step and help us to get your issue resolved that much quicker! 🙂
Thanks again, and we’ll see you in the forums!