Installation error on Joomla 6

[tiamat52]

With Joomla 6.03, there is a 500 internal error when installing the package.
To correct it, there is to do the following.

In install.attachments.php, replace:
_use Joomla\CMS\Filesystem\Folder;

by:
_use Joomla\Filesystem\Folder;

And in packages/attachments_component.zip/install.attachments.php, replace:
_use Joomla\CMS\Filesystem\File;
_use Joomla\CMS\Filesystem\Folder;

by:
_use Joomla\Filesystem\File;
_use Joomla\Filesystem\Folder;

By doing so in the package zip, I was able to install the package correctly.

[tiamat52]

By the way, once installed, the component doesn't work anymore with Joomla 6.03 if you don't do the same with other files in the package.
There are errors like Joomla\CMS\Filesystem\Folder not found when uploading files.

So, besides the changes in:
pkg_attachments/install.attachments.php
attachments_component/install.attachments.php

There is to update the following files:
attachments_component/site/src/View/AttachmentsFormView.php
attachments_component/site/src/Controller/DisplayController.php
attachments_component/admin/src/Controller/AttachmentsController.php
attachments_component/admin/src/Helper/AttachmentsUpdate.php
attachments_component/site/src/Helper/AttachmentsHelper.php
attachments_component/admin/src/Controller/AttachmentController.php

By replacing the uses of:
_use Joomla\CMS\Filesystem\File;
_use Joomla\CMS\Filesystem\Folder;

by:
_use Joomla\Filesystem\File;
_use Joomla\Filesystem\Folder;

[parapente]

@tiamat52 is the joomla compatibility plugin enabled in your joomla installation? I will have a look at the issue but I think it is caused because some namespaces are deprecated/modified in Joomla6

[parapente]

Indeed a clean joomla 6 install with the compatibility plugin disabled doesn't allow the extension to be installed. With compatibility enabled, the extension works as expected. I will put a warning in install script if it isn't enabled for now.