gettin activation error when i activate ad sharing plugin

gettin activation error when i activate ad sharing plugin

Deprecated: Assigning the return value of new by reference is deprecated in /home4/ardge25/public_html/wp-content/plugins/ad-sharing/ad-sharing.php on line 44

Strict Standards: Redefining already defined constructor for class Ad_Sharing in /home4/ardge25/public_html/wp-content/plugins/ad-sharing/ad-sharing.php on line 97

Deprecated: Assigning the return value of new by reference is deprecated in /home4/ardge25/public_html/wp-content/plugins/ad-sharing/ad-sharing.php on line 685

The plugin generated 588 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.

any suggestion of fixes please?