8.4.0 class was not found in the chain configured namespaces

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I followed this article on creating custom attribute category:
https://documentation.concrete5.org/developers/attributes/advanced-c...

The package got installed fine. But visiting the created single page I get the following error:
" Doctrine \ Common \ Persistence \ Mapping \ MappingException
The class 'Concrete\Package\MY_PACKAGE\Entity\Attribute\Key\MyKey' was not found in the chain configured namespaces Concrete\Core\Entity, MyEntity"

linuxoid
 
linuxoid replied on at Permalink Reply 1 Attachment
linuxoid
I've set up a completely new package Calendar and copied everything from this documentation page:
https://documentation.concrete5.org/developers/attributes/advanced-c...

The package is attached.

And it doesn't work. It throws an exception:

"Doctrine \ Common \ Persistence \ Mapping \ MappingException
The class 'Concrete\Package\Calendar\Entity\Attribute\Key\EventKey' was not found in the chain configured namespaces Concrete\Core\Entity, MyCal"

What's wrong with it?

Thank you.
linuxoid replied on at Permalink Reply
linuxoid
Anyone could help figure out how to use custom object attributes and categories? The example from Documentation doesn't work.

Thank you.