Wp 3.0 themes not compatible with wp 2.9

Hello everyone,

Have you noticed that wp 3.0 themes are not compatible with wordpress 2.9(even the new 3.0 default theme got this issue), i recive this error:

Fatal error: Call to undefined function register_nav_menus()

PHP:

What do you suggest?

Thank you

 

open header.php and replace

<?php wp_nav_menu( array( 'container_class' => 'menu-header', 'theme_location' => 'primary' ) ); ?>

Code (markup):

with

<?php wp_page_menu( ); ?>

Code (markup):

 

They would be compatible if their authors checked for new functions before using them. It's pretty basic, all you need to do is this:

if ( function_exists( 'register_nav_menus' ) ) {
   register_nav_menus(...);
}

Code (markup):