I put in about 35 plugins and got error messages when I activated some of them. Also getting error

About 10 out of the 35 plugins had conflicts so in deactivated them.

I also am getting the following errors and not sure where they are coming from.

Incoming Links "Errors" (found in my dashboard)

Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/bostoncommons.net/httpdocs/wp-includes/class-simplepie.php on line 738 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/bostoncommons.net/httpdocs/wp-includes/class-simplepie.php on line 1108 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/bostoncommons.net/httpdocs/wp-includes/class-

Wordpress Blog "Errors"

Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/bostoncommons.net/httpdocs/wp-includes/class-simplepie.php on line 738 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/bostoncommons.net/httpdocs/wp-includes/class-simplepie.php on line 1108 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/bostoncommons.net/httpdocs/wp-includes/class-simplepie.php on line 1602 Deprecated:

Not sure what these are. Also, not sure I'm doing this right, putting in 35 plugins. Don't know how to make them all work together. Is there any advice on this?

Thanks!