Re-naming Admin creates php errors

[teragram]

..............?

Here are the errors messages with the sensitive data expunged:
Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at ...shop/admin/includes/configure.php:183) in ...shop/includes/functions/sessions.php on line 108

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at .../shop/admin/includes/configure.php:183) in ...shop/includes/functions/sessions.php on line 108

Warning: Cannot modify header information - headers already sent by (output started at ...shop/admin/includes/configure.php:183) in.../shop/admin/includes/init_includes/init_templates.php on line 36

Line 183 in the configure.php document is after the closing ?>
It is a blank line. Could the blank line be causing the problem?