Blank wp-admin page

I tried deleting plugins, changed my .htaccess. Nothing.

In debug, I get this:

Warning: session_start(): Cannot send session cookie – headers already sent by (output started at server/address/stuff/public_html/clayburn/blog/wp-includes/compat.php:1) in server/address/stuff/public_html/clayburn/blog/wp-content/plugins/very-simple-contact-form/vscf_main.php on line 4 Warning: session_start(): Cannot send session cache limiter – headers already sent (output started at server/address/stuff/public_html/clayburn/blog/wp-includes/compat.php:1) in server/address/stuff/public_html/clayburn/blog/wp-content/plugins/very-simple-contact-form/vscf_main.php on line 4 Warning: Cannot modify header information – headers already sent by (output started at server/address/stuff/public_html/clayburn/blog/wp-includes/compat.php:1) in server/address/stuff/public_html/clayburn/blog/wp-includes/pluggable.php on line 1171

/wp-admin results in a blank page. wp-login.php gets a login screen with a cookies error and I can’t log in.