solved: data in select menu not shown

solved: data in select menu not shown

I get data with this:

$.getJSON("Personen.php", function(data) {
                $.each(data, function(key, value) {
                    $("<option value='" + key + "'>" + value.Person + "</option>").appendTo("#projekt_autor");

and append it to a select menu:
<div data-role="fieldcontain">
                    <label for="projekt_autor" class="select">Autor:</label>
                    <select name="projekt_autor" id="projekt_autor">
                        <option>Autor w&auml;hlen...</option>

Firebug shows the data to be in the page:

<label for="projekt_autor" class="select ui-select">Autor:</label>
      <div class="ui-select">
      <a class="ui-btn ui-btn-icon-right ui-btn-corner-all ui-shadow ui-btn-up-c" data-theme="c" aria-haspopup="true" role="button" href="#">
      <span class="ui-btn-inner ui-btn-corner-all">
      <span class="ui-btn-text">Autor wählen...</span>
      <span class="ui-icon ui-icon-arrow-d ui-icon-shadow"></span></span></a>
      <select tabindex="-1" name="projekt_autor" id="projekt_autor">
            <option>Autor wählen...</option>
            <option value="0">Affolter Theo, -</option>
            <option value="1">AGEO -, -</option>
            <option value="2">BACHMANN P., -</option>

But when I click the select menu, only the null option is shown (<option>Autor w&auml;hlen...</option>).
How can I get all the data to show?
Here's the page:

Very grateful for help!

here's the script: Projekt.txt