Your theme (I am assuming) has deregistered the default jQuery bundled with WordPress (ver 1.8.3) and is instead loading version 1.4.2. That isnt compatible with the calendar.
You can either look to resolve the issue by changing the theme code (functions.php) or by referring back to the theme developer for a fix.
If you want to do it yourself, check the functions.php for a piece of code that looks similar to this (it wont be identical)
add_action( 'admin_enqueue_scripts', 'my_enque_func' );
function my_enque_func()
{
wp_deregister_script('jquery');
wp_register_script(...); // Register your own script
}
Either comment that out or remove it.
Backing up your functions.php file first is recommended in case something goes wrong.
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