Hello everyone, I have problem with installation of drop down menu. Installation is performed on plone 5.1.4 but it isn't working i got this:
We’re sorry, but there seems to be an error…
Here is the full error message:
Display traceback as text
Traceback (innermost last):
Module ZPublisher.Publish, line 138, in publish
Module ZPublisher.mapply, line 77, in mapply
Module ZPublisher.Publish, line 48, in call_object
Module plone.z3cform.layout, line 63, in call
Module plone.z3cform.layout, line 47, in update
Module quintagroup.dropdownmenu.browser.controlpanel, line 36, in update
Module quintagroup.dropdownmenu.browser.controlpanel, line 44, in _overrideValue
AttributeError: can't set attribute
anyone can help me?