How to solve this PHP fatal error after installing module?
Put the module back. Check its code. Delete the problematic function named in the corresponding error message from it. Go to admin page. Uninstall the module.

Try to reinstall the module in a proper location. Don't name the folder easy_booking-7.x-2.4. Simply name it easy_booking. If the error still occurs, file a bug at https://www.drupal.org/project/issues/easy_booking?status=All&amp;categories=All