Do you have a solution for these error messages?

I need your help, because it’s been 10 hours and I’m looking for I can not find!

Warning: session_start(): Cannot send session cookie – headers already sent by (output started at /home/XXXXXX/public_html/wp-config.php:1) in /home/XXXXXX/public_html/wp-content/plugins/wp-cart-for-digital-products/wp_eStore1.php on line 5

Warning: session_start(): Cannot send session cache limiter – headers already sent (output started at /home/XXXXXX/public_html/wp-config.php:1) in /home/XXXXXX/public_html/wp-content/plugins/wp-cart-for-digital-products/wp_eStore1.php on line 5

Thanks