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    Hi Gabriele,
    Are you using Magento 1.4.1?
    Please try with this:

    A Magento Forum search suggested that the same thing happened with anyone using the Modern Theme. The fix is to change page.xml

    <block type="core/profiler" output="toHtml"/> should be changed to:

    <block type="core/profiler" output="toHtml" name="core_profiler"/>

    When do you downloaded the theme?

    Best regards.