3.5 upgrade but now faulty

Hi,

I installed the 3.5 upgrade but now I cannot log into my site admin. I get this error:-

” Warning: Cannot modify header information – headers already sent by (output started at /home/content/s/u/g/sugastore/html/shanel/wp-config.php:157) in /home/content/s/u/g/sugastore/html/shanel/wp-includes/pluggable.php on line 876 “

Once installed I was able to work on the site but I kept finding the above error kept showing up when I was updating pages etc.

Sometimes when I go to the login page and log-in I get a list of these messages – – – – – – – – – – – – –

” Warning: Cannot modify header information – headers already sent by (output started at /home/content/s/u/g/sugastore/html/shanel/wp-config.php:157) in /home/content/s/u/g/sugastore/html/shanel/wp-login.php on line 368

Warning: Cannot modify header information – headers already sent by (output started at /home/content/s/u/g/sugastore/html/shanel/wp-config.php:157) in /home/content/s/u/g/sugastore/html/shanel/wp-login.php on line 380

Warning: Cannot modify header information – headers already sent by (output started at /home/content/s/u/g/sugastore/html/shanel/wp-config.php:157) in /home/content/s/u/g/sugastore/html/shanel/wp-includes/pluggable.php on line 680

Warning: Cannot modify header information – headers already sent by (output started at /home/content/s/u/g/sugastore/html/shanel/wp-config.php:157) in /home/content/s/u/g/sugastore/html/shanel/wp-includes/pluggable.php on line 681

Warning: Cannot modify header information – headers already sent by (output started at /home/content/s/u/g/sugastore/html/shanel/wp-config.php:157) in /home/content/s/u/g/sugastore/html/shanel/wp-includes/pluggable.php on line 682

Warning: Cannot modify header information – headers already sent by (output started at /home/content/s/u/g/sugastore/html/shanel/wp-config.php:157) in /home/content/s/u/g/sugastore/html/shanel/wp-includes/pluggable.php on line 876″

I tried installing a second version (network) version of wordpress by altering the wp-config file to allow for this – but for this other wp site I get the same message when I try to login.

Any suggestions welcome.

Thanks!