Addons fail to load in 6.0 [Addon Manager installs from outdated Project]

[Woody]

I just installed Gramps 6.0 RC2. Unfortunately, the installation of the add-on modules failed.
Only the window appeared.

By RC1 there are no Problems with this.

[Woody]

When I then try to install a plugin from the extension manager, this error occurs:

227187: ERROR: grampsapp.py: line 188: Unhandled exception
Traceback (most recent call last):
File "C:\Program Files\GrampsAIO64-6.0.0\gramps\gui\plug\_windows.py", line 322, in __on_install_clicked
self.manager.install_addon(addon["i"])
File "C:\Program Files\GrampsAIO64-6.0.0\gramps\gui\plug\_windows.py", line 557, in install_addon
self.__pmgr.reg_plugins(
File "C:\Program Files\GrampsAIO64-6.0.0\gramps\gen\plug\_manager.py", line 224, in reg_plugins
r_class = getattr(mod, plugin.ruleclass)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'HasEventBasePlus'

When I restart Gramps, this screen appears:

[Brinycoolie]

same here! with exact same messages. Re-install from source doesn’t help.

[Nick-Hall]

@Woody

I just installed Gramps 6.0 RC2. Unfortunately, the installation of the add-on modules failed.

Which addons fail? The error message appears to relate to a third-party rule.

[Woody]

I can’t tell you exactly which ones they are. Here’s a screenshot of the plugins.
There are many …

[emyoulation]

The project list was set to the 5.2 addons_xx.json URLs. And the 6.0 Addon Manager actually installed those Addons, despite the Target Version being 5.2 version of Gramps. Then the Gramps Plugin Registration refused to load the outdated addons.

Solution was to update the Project URLs in the Projects tab of the Addon Manager to the 6.0 URLs and re-install with 6.0 target version addons.

Bug filed: 0013789 [Addon Manager] incompatible Addons are listed for installation

See also:

Windows installation [of 5.2 addons] problem with 6.0.0 and 6.0.1

I think you are trying to load the 5.2 plugins on a 6.0 system. You will have to download the 6.0 versions using the Addon Manager. (Delete the gramps/gramps60/plugins folder first. You want to start fresh.) Be certain to double-check the “Projects” tab to make certain that all of them have the 6.0 URLs. (There is another posting with a list of the collections outside of the Gramps-Project.) For example, the following examples are curated 5.2 addon collection “projects” and, while the addons …