Drupal 8.x

I have a Drupal 8 site that broke today. After clearing cache I get an error 500 on all pages. error_log says:

Class name must be a valid object or a string in XXXXX/core/modules/field/src/FieldStorageConfigStorage.php on line 160

Hi everyone, i encounter something pretty weird, i don't know if it is normal but i have my main navigation with 4 items, lets say :

item 1 - item 2 - item 3 - item 4, i did set the order that way in the menu -> main navigation and saved, i check on the front end its all good but it seem that as soon as i save a nede or clear cash it go back to the initial order ? is that something normal ? how can have stop this ?

Thank you.

Hello everyone, My site currently has a contact form defaulted to forward messages to my email. I want to be able to access it directly when I log into my site instead of my email address. How do I do it? Please help.

Hello everyone, I developing a website and would like to include a page with list of PDF contents where people can click on and read the content. How do I do it? Do I need a special module for it? How do I go about it? Please help.

Hello,

I am setting up my first Drupal site *locally* - using Dev Desktop.

I ran into the Trusted Host Settings issue and found a thread discussing a solution.

Basically adding below code to the settings.php file:

$settings['trusted_host_patterns'] = array(
   '^localhost$',
 );

I then went here to enter the code: Site1/sites/default/settings.php

I am new to Drupal (but have been a developer/designer for a long time) and trying to figure out the Block/View relationship as it applies to the Views Slideshow.

The main config I want to do is to set the slideshow for the frontpage only. But there will also be other content on the home page (normal text).

I have verified that the module itself and jquery.cycle is working fine. I can create a block or a view(page type) and set it to slideshow and it shows fine. It also will show in the preview with no problems.