Fatal error after activating

  • Hello!

    I have the WP 2.8. After I’m trying to activate the Simple Tags Plugin I’m getting this error message

    Fatal error: Call to undefined method stdClass::add_query_var() in /wp-includes/taxonomy.php on line 180

    How can I fix this error? The author of the Simple Tags plugin assured me his plugin is working with the WP 2.8

    Simple tags plugin 1.6.6.

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