After update headers warning

Hi,
I just updated to the newest version. I have wordpress posts included on my static website.
That worked very well, but now I get these warnings:

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /data/home/tina01/domains/tina-turner.nl/public_html/news.php:242) in /data/home/tina01/domains/tina-turner.nl/public_html/blog/wp-content/plugins/wordpress-social-login/wp-social-login.php on line 63

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /data/home/tina01/domains/tina-turner.nl/public_html/news.php:242) in /data/home/tina01/domains/tina-turner.nl/public_html/blog/wp-content/plugins/wordpress-social-login/wp-social-login.php on line 63

What can I do?
For now I have deactivated the plugin.
My site is: http://www.tina-turner.nl

Johanna

https://wordpress.org/plugins/wordpress-social-login/