Fatal error on /node/add Drupal8.1.8

Hi there,
I have been adding content from an old HTML site to my Drupal 8.1.8 install and added sever hundered pages. Suddenly I get a error message "The website encountered an unexpected error. Please try again later." for any page node add ( but not node/add/article)

Logs give warning and two error messages
Warning: Error while sending QUERY packet. PID=1366 in Drupal\Core\Database\Statement->execute() (line 59 of /var/www/vhosts/esp.andalucia.ws/httpdocs/core/lib/Drupal/Core/Database/Statement.php).

and

Group menus select list with optgroup "Drupal 8"

I am trying to group the menu links under optgroup for each of the menu parents, my menus are to big and there is at least 10 different ones, i been trying to use the api info for templete_preprocess_select() and form_select_options() but i seem unable to get it to work.

This is what i got so far in my venus.theme file, i get no errors but it does not output into optgroups.

Import Disqus comments to Drupal comments?

Hi,

it it possible to import the disqus comments which were made already under my nodes to drupal comments? I want to switch back to drupal comments but i dont want to lose the comments?

thanks for help

Do I need to create repository to add modules to Drupal on Acquia Cloud?

I created my Drupal website on Acquia Cloud, and am at the stage of adding modules. After some Googling, I came across an article on Acquia Cloud's website that said this:

"If your website is hosted on Acquia Cloud, the module directories are part of the code repository, which is not directly writable. This means that you can't add a module using the Update Manager or SFTP."

Does this mean I need to work with the code locally, before pushing the changes to the website? I'm kind of confused because I was able to install a module through my drupal site.

Custom Theme, Drupal 8 Development For SeaFirst Insurance

SeaFirst Insurance Drupal 8 Website Development

North Studio developed a new website, including a custom Drupal theme development, for SeaFirst Insurance of Vancouver Island, British Columbia, Canada.

SeaFirst came to North Studio for a Drupal 8 rebuild that would add increased functionality to their current site to connect, engage, and create relationships with their clients. It was important to have complex functionality while ensuring ease-of-use for site administrators.

Sectors: 
Banking and Financial

Generate XML from uploaded files

Hi,

need some help with my plupload upload and xml creation. After long reading i created my first module with Drupal 8. I have integrated the plupload widget and the upload runs. My problem is that i have a input field for the e-mail too. After i have uploaded my files i want foreach them and create a xml file from each file. I thought i can create a new document with DOMDocument. But Drupal 8 says that it can't find this class. How can i do that?

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