error message

I am getting the following error message. I am also having issues with slider revolution and flexslider which it says is recommended by inovado theme but my site crashes when I add activate them.
Warning: Declaration of TGM_Bulk_Installer_Skin::after() should be compatible with Bulk_Upgrader_Skin::after($title = ”) in /home/fairfind/public_html/prosperousmassage.com/wp-content/themes/inovado/framework/inc/plugin-activation.php on line 1893
Any idea what is causing the issue? I just upgraded my support to get an answer for this. Thanks in advance

http://prosperousmassage.com/

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