Canadian moviegoers took to social media Tuesday morning to express frustration over Cineplex Inc.’s website and mobile app, which both crashed after advance tickets for Avengers: Endgame went on sale.

The movie theatre company said on Twitter that its website is experiencing technical issues and it is working to fix it.

A number of customers took to Facebook and Twitter to complain about their inability to access the site as they attempted to purchase tickets.

The first day of screenings for the film begins April 25.