4.0 nightly build.
Go to administrator/index.php?option=com_templates&view=templates
Click on "Cassiopeia Details and Files"
See file list on the left:
File joomla.asset.json is missing.
Shall we add json to https://github.com/joomla/joomla-cms/blob/4.0.0-alpha6/administrator/components/com_templates/config.xml#L45 ?
Users can configure allowed souce formats via administrator/index.php?option=com_config&view=component&component=com_templates , too, but maybe a little bit more user friendly if...
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| Status | New | ⇒ | Closed | 
| Closed_Date | 0000-00-00 00:00:00 | ⇒ | 2019-01-07 01:14:43 | 
| Closed_By | ⇒ | ReLater | 
My comment. I think we should change the
config.xmlas @ReLater ReLater has suggested. I think that's just been forgotten here: #22435