contribute_to_class() takes exactly 3 arguments (4 given)

[Darex1991]

Hi when i syncdb i get error:

ajaximage\fields.py", line 34, in contribute_to_class
super(AjaxImageField, self).contribute_to_class(cls, name, virtual_only)
TypeError: Error when calling the metaclass bases
contribute_to_class() takes exactly 3 arguments (4 given)

then I remove virtual_only from 34 line and i get now error when I try save model:

"ajaximage\widgets.py in render, line 57"
"Error during template rendering
In template C:\Python27\lib\site-packages\django\contrib\admin\templates\admin\includes\fieldset.html, error at line 19"

If anyone have the same problem, please help me.. a try:

Replace (ajaximage\widgets.py in render, line 57):
file_url = value.url if value else ''
with:
file_url = value.url if value else str('')

I DO IT!!! But when i save model without name I get error about file_url = value.url if value else ''
I remove virtual_only=False and virtual_only from contribute_to_class in fields.py. THe results:
ajaximage\fields.py line 33- 35:

def contribute_to_class(self, cls, name):
super(AjaxImageField, self).contribute_to_class(cls, name)
setattr(cls, self.name, self.descriptor_class(self))

I try :
#12