Drupal 8.x

I'm trying to edit the teaser display for the Article content type. When I select "teaser", then hit the "Manage Display" button, I get the dreaded "The website encountered an unexpected error." This only happens with the Article/teaser display. The Page content type correctly manages the display of teasers.

Any hint as to a solution?

I set up a private file path in settings.php, and set up a form to upload files to it. They're getting in there sure enough, but once there I cannot access them. Even Administrators get "You are not authorized to access this page" when trying to look at the files.

I added the "Private files download permission" module and set up file access permissions. No change. I put a debugger statement in  pfdp.module and got no response from it.

I built a module displaying data in a table. As there are lots of records to display I would like to add a pager. I have been able to display the pager but it's not looping through the pages. Here is my code:

Hey,

Flawlessly updated my localhost install to Drupal 8.5.

Was reading about Media Extension, but not having a whole lot of experience in Drupal - I'm having a hard time understanding exactly what it is. My initial thought was a gallery of images I use on my site, so I can use them elsewhere. (akin to Wordpress)... Does not seem to be the case.

What benefit does it bring to Drupal that was not there before? I'm having a difficult time figuring that out.

Any advice is appreciated as I'm hoping I'm not the only person wondering!

Thanks!

I upgraded my site in the usual manner:

~/drupal-8.5.0$ cp -R core ../
~/drupal-8.5.0$ cp -R vendor ../
~/drupal-8.5.0$ cp *.php ../
~/drupal-8.5.0$ cp *.json ../
~/drupal-8.5.0$ cp *.config ../

But then get a "server encountered an unexpected error message. I tried it twice with the same results.

I am on a hosted server and cannot use composer or drush alas. What could be wrong?

Thanks in advance for any help

Hello all

I'm trying to custmize simplenews form. I put it in a block and displaying it in my front page.

I have activated debug mode so the code tells me where I can find each element, sorray that the code is quite long, you can skip :