Hi, I've got a Script(Python) which is a method of a ZClass, now if I call this script using an instance of the ZClass I get: Error Type: IndexError Error Value: string index out of range The script is called from a form, which set's some variables in the request. The script itself also has parameters which default to None and then checks if they are set, so that these settings override the request-variables. Anyway, even If I comment out the whole code I get this weird error. Here is the PageTemplate snippet containing the form. How can I track down this problem? I really have no Idea how to get to the point where this Error comes from <form method="POST" action="vergeben" tal:attributes="action string:Arbeiten/${request/arbeit}/vergeben" tal:condition="python:Attribute.getProperty('Status') == 'zu vergeben'"> <input type="hidden" name="DestinationUrl" value="index_html" tal:attributes="value python:here.absolute_url()"> <table border="0"> <tr> <td><span class="Arbeit">Name des Studenten:</span></td> <td><input size="40" type="text" name="Studentname" value=""></td> </tr> <tr> <td><span class="Arbeit">Email des Studenten:</span> </td> <td><input size="50" type="text" name="Studentemail" value=""> </tr> </table> <input type="submit" name="Vergeben" value="Arbeit vergeben"> </form> Sorry for the german text, but I don't think that it is a problem. Andreas -- Do nothing unless you must, and when you must act -- hesitate.