Drupal 8 module triggering error

I'm writing my first Drupal 8 module and on top of that my OO-fu is very weak. I've created a skeleton module and it works fine. Where I'm running in to problems is trying to make an admin page for settings. I'm using this as my guide: https://befused.com/drupal/drupal8-admin-form-guide. When I clear the cache, I get the following error in the logs "Error: Unsupported operand types in /var/www/html/drupal_2020/core/lib/Drupal/Core/Routing/RouteBuilder.php on line 163".

Translation Files missing (8.8.3)

I just upgraded Core to 8.8.3 from 8.8.2. My site language is German. Now I get the message that translation-files for English are missing for 70 projects, eg. 

Drupal 8 webform : Download just the filtered submissions

Hi, I'm using webform module in my drupal site. I want to download just the filtered submissions. I don't want to download all submissions. is there any way to do that ? 

Why isn't core updating when composer says it was updated?

Going from 8.8.2 to 8.8.3, I did:

Hybrid Drupal-Magento model for In The Light Urns

Homepage of In The Light Urns website with several images of urns

In The Light Urns Inc. is constantly in the pursuit of providing the perfect urn, that last gift, for your loved one. It understands how stressful and agonising it is to lose your loved one. It tries to make the purchase of cremation urns, keepsakes and jewellery as easy as possible. It ensures that a heartwarming, fitting and perfect last gift is offered to the person who was very dear to you. It is this love and warmth that they offer to people in times of distress that has made them the largest online urn company in America.

Department of Foreign Affairs — GovCMS migration

Screenshot of the homepage for Australia's Department of Foreign Affairs.

Salsa Digital migrated the Department of Foreign Affairs and Trade’s corporate website from SharePoint to GovCMS Drupal 8, delivering many benefits.

Sectors: 
Government

Pages

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