ERROR: posting to smush.it

Hello, i installed this plugin and tryed to reduce the size of the image on my website, but i get the error on the title, anyway i read there is some problem with the API, anyway i’ve removed the plugin but in my web page source i get this error on the js script side (multiple time) in the following code section:

<script type="text/javascript" id="slb_footer">/* <![CDATA[ */if ( !!window.jQuery ) {(function($){$(document).ready(function(){if ( !!window.SLB && SLB.has_child('View.init') ) { SLB.View.init({"ui_autofit":true,"ui_animate":true,"slideshow_autostart":true,"slideshow_duration":"6","group_loop":true,"ui_overlay_opacity":"0.8","ui_title_default":false,"theme_default":"slb_default","ui_labels":{"loading":"Loading","close":"Close","nav_next":"Next","nav_prev":"Previous","slideshow_start":"Start slideshow","slideshow_stop":"Stop slideshow","group_status":"Item %current% of %total%"}}); }
if ( !!window.SLB && SLB.has_child('View.assets') ) { {$.extend(SLB.View.assets, {"http:\/\/www.mywebsite.com\/wp-content\/uploads\/2015\/03\/myphoto.jpg":{"id":1460,"_entries":[],"type":"image","source":"http:\/\/www.mywebsite.com\/wp-content\/uploads\/2015\/03\/myphoto.jpg","internal":true,"sizes":{"thumbnail":{"file":"myphoto-150x150.jpg","width":150,"height":150,"mime-type":"image\/jpeg","wp_smushit":"ERROR: posting to Smush.it"}, etc, etc...

“wp_smushit”:”ERROR: posting to Smush.it”}

is possible to remove all reference of this error / plugin from my page source code?

https://wordpress.org/plugins/wp-smushit/