[Plugin: All-in-One Event Calendar] Crash on activation

Hi! I’m having the same problem. I had previously installed it successfully in a previous installation. I wanted to use it in another site and got the same error everyone here is getting.

Site is visible but I get this warning
Warning: Call-time pass-by-reference has been deprecated in /home/angelicacarballo/strategicmedicalpr.com/wp-content/plugins/all-in-one-event-calendar/app/helper/class-ai1ec-events-helper.php on line 851

When I try to enter the dashboard I get this
Warning: Call-time pass-by-reference has been deprecated in /home/angelicacarballo/strategicmedicalpr.com/wp-content/plugins/all-in-one-event-calendar/app/helper/class-ai1ec-events-helper.php on line 851

Fatal error: Call to a member function getOffset() on a non-object in /home/angelicacarballo/strategicmedicalpr.com/wp-content/plugins/all-in-one-event-calendar/app/helper/class-ai1ec-events-helper.php on line 1017

Moved into another hosting, the same problem:
Fatal error: Call to a member function getOffset() on a non-object in /home/www/daytona.vn.ua/wp-content/plugins/all-in-one-event-calendar/app/helper/class-ai1ec-events-helper.php on line 1017
But at the same time it works perfectly at another my wordpress site. How can I find where the problem is?

DateTimeZone: 1 DateTime: 1 Exception: 1

I’ve found the problem.
This plugin doesn’t work together with https://pageflipgallery.com/
How it can be fixed?

But I’m not using pageflipgallery

Still the same at 1.2.5 v_V

Fatal error: Call to a member function getOffset() on a non-object in ../wp-content/plugins/all-in-one-event-calendar/app/helper/class-ai1ec-events-helper.php on line 1017