I have no access to the Admin only block...

I do have the welcome screen, but the header has the following error message

Warning: Cannot modify header information - headers already sent by (output started at /usr/local/psa/home/vhosts/isobes.com/httpdocs/geeklog/config.php:769) in /usr/local/psa/home/vhosts/isobes.com/httpdocs/geeklog/system/lib-sessions.php on line 188

Warning: Cannot modify header information - headers already sent by (output started at /usr/local/psa/home/vhosts/isobes.com/httpdocs/geeklog/config.php:769) in /usr/local/psa/home/vhosts/isobes.com/httpdocs/geeklog/system/lib-sessions.php on line 200

Warning: Cannot modify header information - headers already sent by (output started at /usr/local/psa/home/vhosts/isobes.com/httpdocs/geeklog/config.php:769) in /usr/local/psa/home/vhosts/isobes.com/httpdocs/lib-common.php(98 : eval()'d code on line 1

I can't figure this out, any help would be appreciated!

Thanks

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