Error message with calendars

Hello! I am having an issue with calendars. I normally use the “Date Range” to filter the events for my calendars. However, since last night, all my calendar report this issue. I switched to other filtering options (like “next week”, etc) and they work fine; but i need the date range working properly again! Please help!

error message:
Fatal error: Uncaught exception ‘Exception’ with message ‘DateTimeZone::__construct(): Unknown or bad timezone ()’ in /home4/turenita/public_html/wp-content/plugins/sportspress/includes/abstracts/abstract-sp-secondary-post.php:50 Stack trace: #0 /home4/turenita/public_html/wp-content/plugins/sportspress/includes/abstracts/abstract-sp-secondary-post.php(50): DateTimeZone->__construct(”) #1 [internal function]: SP_Secondary_Post->range(‘ AND ( \n wp_te…’) #2 /home4/turenita/public_html/wp-includes/class-wp-hook.php(288): call_user_func_array(Array, Array) #3 /home4/turenita/public_html/wp-includes/plugin.php(244): WP_Hook->apply_filters(‘ AND ( \n wp_te…’, Array) #4 /home4/turenita/public_html/wp-includes/class-wp-query.php(2376): apply_filters_ref_array(‘posts_where’, Array) #5 /home4/turenita/public_html/wp-includes/class-wp-query.php(3222): WP_Query->get_posts() #6 /home4/turenita/public_html/wp-includes/post.php(1704): WP_Query->query(Array) #7 /home4/turenita/public_html/wp-content/plugins/sportspress/includes/c in /home4/turenita/public_html/wp-content/plugins/sportspress/includes/abstracts/abstract-sp-secondary-post.php on line 50

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