The is_main_query() method was introduced in WordPress 3.3. The current version of WordPress is 3.5.1. If your WordPress version is showing 3.5.1, go to WP Admin > Dashboard > Updates and click “Re-install Now”.
Many thanks, the problem was a hoster-special-edition of WordPress. This said, is was uptodate, but it was version 3.2.1, not 3.5.1.
I have now manually updatet to 3.5.1 and it works fine.
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