problom with robots.txt

hello,
i have a problom with robots.txt in Google webmaster tools.i got “Syntax not understood” even make robots manually or with plugins.
this is my robots :
User-agent: *
Disallow: /cgi-bin/
Disallow: /wp-admin/
Disallow: /wp-includes/
Disallow: /wp-content/plugins/
Disallow: /wp-content/cache/
Disallow: /wp-content/themes/
Disallow: /wp-login.php
Disallow: /wp-register.php
Disallow: /?page_id=34
Disallow: /2011/07/21
Disallow: /2011/07/raising-cash
Disallow: /sample-page
Disallow: /?author=1
Disallow: /author/admin