mat3osz

Hi! I need some help with PHP. A few days ago I installed the plugin into Wordpress. Everything worked, but today an error occurred. Line 210 and 211: $start_date = get_post_meta( $post_id, 'event-start-date', true ); echo date( 'F d, Y', $start_date ); Can somebody be so kind as to tell me what I need to change to resolve this? I need to fix this ASAP ;/ Thanks.