WordPress Script Issue

Deprecated: Assigning the return value of new by reference is deprecated in /home/zumbeel1/public_html/blog/wp-settings.php on line 511

Deprecated: Assigning the return value of new by reference is deprecated in /home/zumbeel1/public_html/blog/wp-settings.php on line 526

Deprecated: Assigning the return value of new by reference is deprecated in /home/zumbeel1/public_html/blog/wp-settings.php on line 533

Deprecated: Assigning the return value of new by reference is deprecated in /home/zumbeel1/public_html/blog/wp-settings.php on line 569

Deprecated: Assigning the return value of new by reference is deprecated in /home/zumbeel1/public_html/blog/wp-includes/cache.php on line 103

Deprecated: Assigning the return value of new by reference is deprecated in /home/zumbeel1/public_html/blog/wp-includes/query.php on line 21

Deprecated: Assigning the return value of new by reference is deprecated in /home/zumbeel1/public_html/blog/wp-includes/theme.php on line 618

Warning: Cannot modify header information – headers already sent by (output started at /home/zumbeel1/public_html/blog/wp-settings.php:511) in /home/zumbeel1/public_html/blog/wp-includes/pluggable.php on line 776

I am running multiple WordPress using WordPress-mu. no idea about Version because now it is not logged in.