The plugin generated 229 characters of unexpected output during activation

When I tried to activate the plugin on the site it show an error on the top of the dashboard as well as on the site.
ERROR :: “Warning : Cannot modify header information – headers already sent by (output started at /home/customer/www/teeb.health/public_html/wp-content/plugins/sticky-side-buttons/ssb-main.php:217) in /home/customer/www/teeb.health/public_html/wp-content/plugins/sg-cachepress/core/Supercacher/Supercacher_Helper.php on line 68”

“The plugin generated 229 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.”

Please help me out with this!

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