Pluggin activation errors

I updated to version 2.8.5 and now my plugins don’t work.

When I try to activate them, I get this error message.

Warning: in_array() [function.in-array]: Wrong datatype for second argument in /mnt/w0502/d02/s30/b026c564/www/blog/wp-admin/includes/plugin.php on line 310

Warning: Cannot modify header information – headers already sent by (output started at /mnt/w0502/d02/s30/b026c564/www/blog/wp-admin/includes/plugin.php:310) in /mnt/w0502/d02/s30/b026c564/www/blog/wp-includes/pluggable.php on line 865

Warning: Cannot modify header information – headers already sent by (output started at /mnt/w0502/d02/s30/b026c564/www/blog/wp-admin/includes/plugin.php:310) in /mnt/w0502/d02/s30/b026c564/www/blog/wp-includes/pluggable.php on line 865

I’ve tried a couple of the suggestions posted on the forum. I’ve deleted any spaces in the plugin.php and pluggable.php. I’ve deleted all the pluggins and uploaded them individually and none of that has worked.

Any help would be greatly appreciated!