Post installation

A strange problem has cropped up for me.  I have several Drupal 10 sites on my development box, and they all worked fine until ...?

I actually spend most of my time working on content on the productions sites so I'm not sure when this happened, but now it seems that the development sites all display an Down for Maintenance Message.  If I reset the mode setting with drush I get the "The website encountered an unexpected error. Try again later.".  Error logs report missing plugins and configuration errors, but these are spurious answers.  

I had set up a website a few years ago using D7, and recently when I tried to log in as admin to update details, all I get is a white screen with the "The website encountered an unexpected error. Please try again later" messge.

I hadn't just been installing anything, or done anything which seemed to precipitate this, and have no idea how to go about sourcing the cause of this.

Information provided on the site is now out of date, and I'm wondering if it's fixable, or if I need to nuke the installation and reinstall a clean version of Drupal or try a less finnicky CMS.

Is it possible to know why a certain module lost its last versions, and if they could be recovered?

Hi,

I have installed d10.3 with the octavia theme-chocolate. I have created a few content types. Now i see that by three content types the is a class defined by the taxonomy item. By two others there is no class before the taxonomy item.

For example: ( https://fredbaltus.nl/d10/berichten/update-huwelijken-archief-nrw-afdeling-rheinland

How to Export Import User Profile Fields? I see only Content Type to export/import but not for User Profile Fields.

Hey,

The Book module is deprecated in D11. A site has book pages only.

How to prepare for D11 migration?

https://www.drupal.org/project/book  How to use? Create new content?

https://www.drupal.org/project/replicate

Please advice.

Jo.