Can't install plugins (especially carousel)

Hi all
I am wanting to install an addon to display photos for my family and friends.
I have tried installing different addons but I have not succeded. Below is a traceback of the error which I am getting now after tying to install any plugin. It seems that I am stuck since I can't uninstall slick and I can't correct the problem. Thanks for any help.

Traceback (innermost last):
Module ZPublisher.WSGIPublisher, line 168, in transaction_pubevents
Module transaction._manager, line 257, in commit
Module transaction._manager, line 135, in commit
Module transaction._transaction, line 282, in commit
Module transaction._compat, line 45, in reraise
Module transaction._transaction, line 273, in commit
Module transaction._transaction, line 465, in _commitResources
Module transaction._compat, line 45, in reraise
Module transaction._transaction, line 439, in _commitResources
Module ZODB.Connection, line 497, in commit
Module ZODB.Connection, line 546, in _commit
Module ZODB.Connection, line 578, in _store_objects
Module ZODB.serialize, line 430, in serialize
Module ZODB.serialize, line 439, in _dump
_pickle.PicklingError: Can't pickle <class 'collective.slick.interfaces.ICollectiveSlickLayer'>: import of module 'collective.slick.interfaces' failed

Version Overview

  • Plone 5.2.3 (5210)
  • CMF 2.4.8
  • Zope 4.5.3
  • Python 3.6.9 (default, Oct 8 2020, 12:12:24) [GCC 8.4.0]
  • PIL 6.2.2 (Pillow)
  • WSGI: On
  • Server: waitress 1.4.4

Peter

Likely incompatible with Python 3, as the package metadata indicates.