Plugin Error when activated

  • When I activate any plugin, I get this error message

    Warning: Invalid argument supplied for foreach() in /home/httpd/vhosts/xtaur.us/httpdocs/wp-admin/upgrade-functions.php on line 504

    Warning: Cannot modify header information – headers already sent by (output started at /home/httpd/vhosts/xtaur.us/httpdocs/wp-admin/upgrade-functions.php:504) in /home/httpd/vhosts/xtaur.us/httpdocs/wp-admin/admin.php on line 10

    Warning: Cannot modify header information – headers already sent by (output started at /home/httpd/vhosts/xtaur.us/httpdocs/wp-admin/upgrade-functions.php:504) in /home/httpd/vhosts/xtaur.us/httpdocs/wp-admin/admin.php on line 11

    Warning: Cannot modify header information – headers already sent by (output started at /home/httpd/vhosts/xtaur.us/httpdocs/wp-admin/upgrade-functions.php:504) in /home/httpd/vhosts/xtaur.us/httpdocs/wp-admin/admin.php on line 12

    Warning: Cannot modify header information – headers already sent by (output started at /home/httpd/vhosts/xtaur.us/httpdocs/wp-admin/upgrade-functions.php:504) in /home/httpd/vhosts/xtaur.us/httpdocs/wp-admin/admin.php on line 13

    Any clues?

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