Page restriction plugin: it does not work

I checked it out: all is ok.

What could be the problem?

It says:

Interpreting the Error Message:

If the error message states: Warning: Cannot modify header information – headers already sent by (output started at /path/blog/wp-config.php:34) in /path/blog/wp-login.php on line 42, then the problem is at line #34 of wp-config.php, not line #42 of wp-login.php. In this scenario, line #42 of wp-login.php is the victim. It is being affected by the excess whitespace at line #34 of wp-config.php.

…and then says:

# Check that the very first characters are <?php
# Check that the very last characters are ?>

Mmm… i checked out header.php file on line 5… but it seems ok. Anyway have a look to the entire file:
http://pastebin.com/631866

It does not start with “<?php” and it does not end with “?>”. Is it that the problem?

Then…

The error message is:

Warning: Cannot modify header information – headers already sent by (output started at /var/www/vhosts/versionitradotte.it/httpdocs/wp-content/themes/ocadia/header.php:5) in /var/www/vhosts/versionitradotte.it/httpdocs/wp-includes/pluggable-functions.php on line 220

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The line 5 of header.php is:

<meta http-equiv=”Content-Type” content=”<?php bloginfo(‘html_type’); ?>; charset=<?php bloginfo(‘charset’); ?>” />

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The line 220 of pluggable-functions.php is:

header(‘Location: ‘ . get_settings(‘siteurl’) . ‘/wp-login.php?redirect_to=’ . urlencode($_SERVER[‘REQUEST_URI’]));

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It is not related to no extra spaces or lines at the beginning or end of the files. So what could be the reason for that error??