Cannot modify header information when trying to activate

Hi, I just downloaded the plugin, and getting ready to activate it, but when I go to the activate page, I get the following:

Warning: Cannot modify header information - headers already sent by (output started at /home/content/c/c/p/ccpope/html/smobot.com/wp-admin/includes/template.php:1981) in /home/content/c/c/p/ccpope/html/smobot.com/wp-content/plugins/google-analytics-dashboard-for-wp/tools/tools.php on line 116

Warning: Cannot modify header information - headers already sent by (output started at /home/content/c/c/p/ccpope/html/smobot.com/wp-admin/includes/template.php:1981) in /home/content/c/c/p/ccpope/html/smobot.com/wp-content/plugins/google-analytics-dashboard-for-wp/tools/tools.php on line 118

Warning: Cannot modify header information - headers already sent by (output started at /home/content/c/c/p/ccpope/html/smobot.com/wp-admin/includes/template.php:1981) in /home/content/c/c/p/ccpope/html/smobot.com/wp-content/plugins/google-analytics-dashboard-for-wp/tools/tools.php on line 116

Warning: Cannot modify header information - headers already sent by (output started at /home/content/c/c/p/ccpope/html/smobot.com/wp-admin/includes/template.php:1981) in /home/content/c/c/p/ccpope/html/smobot.com/wp-content/plugins/google-analytics-dashboard-for-wp/tools/tools.php on line 118

Warning: Cannot modify header information - headers already sent by (output started at /home/content/c/c/p/ccpope/html/smobot.com/wp-admin/includes/template.php:1981) in /home/content/c/c/p/ccpope/html/smobot.com/wp-content/plugins/google-analytics-dashboard-for-wp/tools/tools.php on line 116

Warning: Cannot modify header information - headers already sent by (output started at /home/content/c/c/p/ccpope/html/smobot.com/wp-admin/includes/template.php:1981) in /home/content/c/c/p/ccpope/html/smobot.com/wp-content/plugins/google-analytics-dashboard-for-wp/tools/tools.php on line 118

Looking at those lines in tools.php it looks like some problem with setting the cookie. Any help to get past this would be appreciated!

https://wordpress.org/plugins/google-analytics-dashboard-for-wp/