VERY URGENT: Please solve this by tomorrow

I have upload your Responsive Video Ultimate plugin into my site: https://minisitedesign.co/demo/dc-estate . But after doing this, when I’m update any other inside my wp-admin area or Dashboard, it is showing following error:

Warning: Cannot modify header information – headers already sent by (output started at /home4/ecvx09/public_html/minisitedesign.co/demo/wp-content/plugins/responsive-video-ultimate/inc/enable_shortcode_widgets.php:2) in /home4/ecvx09/public_html/minisitedesign.co/demo/wp-admin/post.php on line 233

Warning: Cannot modify header information – headers already sent by (output started at /home4/ecvx09/public_html/minisitedesign.co/demo/wp-content/plugins/responsive-video-ultimate/inc/enable_shortcode_widgets.php:2) in /home4/ecvx09/public_html/minisitedesign.co/demo/wp-includes/pluggable.php on line 1173

Please let me know, What I need to do?

This is Live site, so it will be better, if you please tell me solution by tomorrow.

Waiting for your quick reply.

Regards
Sudipta Banerjee

https://www.ads-software.com/plugins/responsive-video-ultimate/