Drupal 8.x

So on and off all day today I have tried to get a D8 module working. I have tried three different examples all with no luck.

I am getting this error:

The website encountered an unexpected error. Please try again later.

ReflectionException: Class \Drupal\hello_world\Controller\HelloController does not exist in ReflectionMethod->__construct() (line 128 of core\lib\Drupal\Core\Entity\EntityResolverManager.php).

I am looking to build a Drupal 8 website that requires the notion of a content type (a job) that has fields for adding tasks that can be assigned a due date and be ticket off when completed.

Then I'll need to be able to show all the tasks on a calendar view, overdue reminders, repeat tasks etc.

Can anyone point me in the right direction as to how I could approach configuring this with core functionality or modules for Drupal 8?

Sincerely,

Andy

Calendar

I'm new to Drupal. I need to 1) have a database of URLs with some additional information such as: text description, category/sub-category, location (country, state/province, city), type and display the results of queries entered by users, 2) be able to maintain the database through a separate screen. The users can't change the data just query it. The database will eventually have tens of thousands of entries. This seems like the kind of thing others would have developed. We're using 8 but I assume I can adapt one from earlier versions.

First, thanks to those who have worked hard developing Core search and Custom search. These tools are wonderfully useful.

I have implemented a Custom Search box that only searches for one content type. It is really pointless showing a dropdown where only one content type is available. Is there a way to hide the dropdown field and label when there is only one content type allowed?

I'd like to mimick the functionality from websites such as these: https://yes.no/alvin-e-roth or wiselike.com and I am fairly certain this is doable with Drupal -like most things.

I've been away from Drupal for a few years, so I am curious if D8 is the way to go or D7? Some of the modules I checked around Voting for instance weren't even stable for D7 :(

Most importantly, unlike the above websites, if I were to host live AMAs a la Reddit, would Drupal perform well or should I start with something else altogether?

Hi,

I have to recreate a content type with just one minor adjustment. Is going to be a lengthy procedure, but saw Bundle Copy and wondered if this was the answer? Also it is supposedly in drupal 8 core... where would i find it? Thanks!