Support

The error message reads (I redacted the full path):

SIGPlusImageServicesConfiguration::setParameters(): Argument #1 ($params) must be of type JRegistry, Joomla\Registry\Registry given, called in /.../plugins/content/sigplus/core.php on line 198

As you can see from the error message, this has nothing to do with our software. It is a bug in a third party content plugin called "sigplus".

Based on the error message I can immediately tell you that the problem is that the plugin has not been updated to support Joomla 3.3.0 or later. This is when Joomla moved from the legacy JRegistry class to the namespaced version \Joomla\Registry\Registry. The old class name was aliased to the new one up to and including Joomla 4.4. The aliasing of this old was removed in Joomla 5.0 and was moved to the backwards compatibility plugin; if you enable the “Behaviour - Backward Compatibility” the plugin has a good chance of still working. The aliasing was removed altogether in Joomla 6.0, regardless of the use of the “Behaviour - Backward Compatibility” plugin.

I would strongly recommend you do two things:

• Enable the “Behaviour - Backward Compatibility” plugin
• Talk to the developer of the sigplus content plugin to see if there is an updated version, or if they plan to update the plugin to work correctly with newer versions of Joomla (I'd assume so; they've been maintaining this plugin for at least 15 years, I don't see them giving up now).

Again, this is not our code. It's someone else's code. That's all I can do for you.