Having the " Trying to access array offset on value of type int" error on my website

Hello everyone,

I'm using Drupal for a school project, in local everything is working but once I put it on the raspberry server, I have the following error:

https://imgur.com/jx6XgHP

There is alot more below... I need to finish it for today, please guys, help me..

NB: I'm using PHP 7.2.4 and the server is using php 7.4.6.

Cordially

What does #-sign in key values mean?

When I put 

{{ dump(content.field_graphics|keys) }}

in a node template I get this entries:

Top Deck Travel

Top Deck Travel

Topdeck Travel selected Drupal to create a website that could bring their proposition to life and enable travelers to be inspired.

Sectors: 
E-Commerce
Travel and Hospitality

Harlow Council

Harlow Council Homepage

Harlow is a town in Essex, England, situated on the border with Hertfordshire and London. Although a new town, Old Harlow dates back to the early medieval age and most of its high street buildings are early Victorian. Harlow Council is responsible for delivering public services to a population of almost 90,000 citizens and the website is an essential tool for residents to access those services, such as schedule waste collection and acquire legal documentation, as well as a source of information about public life and community events.

Sectors: 
Community
Government
Non-profit
Urban planning

two different registration forms display on page

I would like to thank you for this forum!

I'm not a programmer. This forum has often helped me to create my site.

I give up :-(
How to create two different registration forms?
/ user / register - is the default form for users
and I want to keep the current form.
I want to create a separate one for companies (I even organized)

admin / structure / display-modes / form / manage / user. business

only the default registration form is displayed on the page.

on admin/config/people/accounts/display

I have two forms...

Clean URL will not enable

edit: ok this worked. for whatever reason, my code blocks in the previous attempt jacked everything up as "spam" and an exponentially growing "please wait" timer. idk man.

I have rewrites already for http to auto https. this existing configuration is probably causing issues with your suggested config to enable clean url

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