After login get numerous warnings

Hi there,

I have recently installed wordpress in a subdirectory on my site, but when I log in to admin page/panel I get the following warnings:

Notice: Undefined index: REQUEST_URI in /web/wordpress/wp-includes/cron.php on line 214

Warning: Cannot modify header information – headers already sent by (output started at /web/wordpress/wp-includes/cron.php:214) in /web/wordpress/wp-login.php on line 255

Warning: Cannot modify header information – headers already sent by (output started at /web/wordpress/wp-includes/cron.php:214) in /web/wordpress/wp-login.php on line 267

Warning: Cannot modify header information – headers already sent by (output started at /web/wordpress/wp-includes/cron.php:214) in /web/wordpress/wp-includes/pluggable.php on line 658

Warning: Cannot modify header information – headers already sent by (output started at /web/wordpress/wp-includes/cron.php:214) in /web/wordpress/wp-includes/pluggable.php on line 659

Warning: Cannot modify header information – headers already sent by (output started at /web/wordpress/wp-includes/cron.php:214) in /web/wordpress/wp-includes/pluggable.php on line 660

Warning: Cannot modify header information – headers already sent by (output started at /web/wordpress/wp-includes/cron.php:214) in /web/wordpress/wp-includes/pluggable.php on line 850

Can someone please help me to fix this? I am new to all of this. Thanks so much!