[web2py] TypeError: 'instancemethod' object is unsubscriptable

[Annet]

Using this code to customize a form:

<div class="form">
  <div class="form-header">
    <h3>{{=response.functionname}}</h3>
  </div> <!-- /form-header -->
  <div class="form-body">
    {{=form.custom.begin}}
    {{=form.element['table']}}
  </div> <!-- /form-body -->
  <div class="form-footer">
    {{=DIV(form.custom.end[1])}}
    {{=form.custom.end[0]}}
  </div> <!-- /form-footer -->
</div> <!-- /form -->

I get the following error:

Traceback (most recent call last):
  File "/Library/Python/2.5/site-packages/web2py/gluon/restricted.py", line 
205, in restricted
    exec ccode in environment
  File 
"/Library/Python/2.5/site-packages/web2py/applications/bootstrap/views/util/generic.html",
 line 166, in <module>
TypeError: 'instancemethod' object is unsubscriptable


Line 166:

164. response.write(form.custom.begin)
165. response.write('\n            ', escape=False)
166. response.write(form.element['table'])


I am using web2py 1.99.7


Kind regards,

Annet.