[web2py] custom forms wont submitted

[Wahb Isaak]

Hallo

Im using custom form but then i consideret 2 problems

1) errors are not more camputred or displayed
2) form won't be submitted: when i click on submit the page just reload 
(keeping the old values)

in controller i have :
def new():
    form=crud.create(db.i2l_letter)
    if form.accepts(request.vars, session):
        response.flash='Bitte warten'
    elif form.custom.errors:
        response.flash='Bitte fuellen sie das Formular richtig aus'
    else:
        pass
    return dict(form=form)

in view i have

{{if form.errors:}}
  Your submitted form contains the following errors:
  <ul>
  {{for fieldname in form.errors:}}
    <li>{{=fieldname}} error: {{=form.errors[fieldname]}}</li>
  {{pass}}
  </ul>
  {{form.errors.clear()}}
{{pass}}
{{=form.custom.begin}}
<table>
<tr>
<td>{{=form.custom.label.date_format}}</td>
<td>{{=form.custom.label.myref}}</td>
<td>{{=form.custom.label.yourref}}</td>
</tr>
<tr>
<td>{{=form.custom.widget.date_format}}</td>
<td>{{=form.custom.widget.myref}}</td>
<td>{{=form.custom.widget.yourref}}</td>
</tr>
</table>
<div style="float: left; clear:both; margin-top:20px; 
margin-left:50px">{{=form.custom.submit}}</div>
{{=form.custom.end}}
{{pass}}

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