Strict Standards Message

I have a self-hosted site and I just recently reactivated WP Smush along with also updating 3 other plugins (Jetpack, All in One SEO Pack and Google Analytics by Yoast) when I got this Strict Standards Message:

Strict Standards: Only variables should be passed by reference in /home2/pruppel/public_html/wp-content/plugins/photo-dropper/application/core/Bootstrap.php on line 207

Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method gtrans::admin_menu() should not be called statically in /home2/pruppel/public_html/wp-includes/plugin.php on line 496

Strict Standards: Only variables should be passed by reference in /home2/pruppel/public_html/wp-content/plugins/tweetily-tweet-wordpress-posts-automatically/top-admin.php on line 885.

I’m not a programmer and don’t know what to do about this. Is it because I reactivated the WP Smush plugin, as I noticed there was notification this plugin had been deactivated (and gave the php url) because it couldn’t be found. However, I was able to activate it successfully. It was after I updated the other 3 plugins that I got this strict standards message.

Please advise on how I can correct this. Thank you for your assistance ~~ Pat
My site is Plain Talk and Ordinary Wisdom