Strange script showing on dashboard and website

Sorry if this was already posted. I don’t even know where to begin as far as a description of this problem. All of the stuff in quotes (quotes are mine) started showing up on my website last night:

“Strict Standards: Only variables should be passed by reference in /home3/kdmiller/public_html/koridmiller.com/wp-content/plugins/evergreen-post-tweeter/ept-core.php on line 248

Strict Standards: Only variables should be passed by reference in /home3/kdmiller/public_html/koridmiller.com/wp-content/plugins/evergreen-post-tweeter/ept-core.php on line 249

Notice: Undefined index: event_ui_theme in /home3/kdmiller/public_html/koridmiller.com/wp-content/plugins/event-geek/core/gg-scripts.php on line 61

Notice: Undefined index: event_custom_ui_theme in /home3/kdmiller/public_html/koridmiller.com/wp-content/plugins/event-geek/core/gg-scripts.php on line 64

Notice: Undefined property: WP_Locale::$is_rtl in /home3/kdmiller/public_html/koridmiller.com/wp-content/plugins/event-geek/core/gg-scripts.php on line 96

Notice: Undefined index: event_lightbox_transparency in /home3/kdmiller/public_html/koridmiller.com/wp-content/plugins/event-geek/core/gg-scripts.php on line 107

Notice: Undefined index: event_popup_bg_color in /home3/kdmiller/public_html/koridmiller.com/wp-content/plugins/event-geek/core/gg-styles.php on line 7″

My site is https://www.koridmiller.com. At first, I thought it was only on my dashboard. Any idea what’s going on? Thanks!