Error while compiling CSS – Events not displaying properly

This plug-in worked until the recent upgrade. Now my events are plain text and non-formatted (https://www.azhdi.com/calendar/).

I tried to enable a different theme and receive a compile error:
All-in-One Event Calendar:
There was an error while compiling CSS. The message returned was: variable @calendarTitle is undefined in file /home3/azhdicom/public_html/wp-content/plugins/all-in-one-event-calendar/public/themes-ai1ec/vortex/less/user-variable-map.less in user-variable-map.less on line 31, column 33 29| @dropdown-link-hover-bg: @dropdownLinkBackgroundHover; 30| @input-color-placeholder: @placeholderText; 31| @calendar-title-color: @calendarTitle; 32| @today-color: @todaycolor; 33| @allday-badge-color: @alldayBadgeGradientMiddle; 34| @event-image-shadow: @eventImageShadow;

I deleted and reinstalled the plug-in and still the same.

Please advise.