Drupal 8.x

Hi,

After a lot of preparation work, I try to install a clean version of Drupal (latest version 8.4.5) under MAMP, but I have a lot of errors :(

First of all dozens of lines of this type :

Deprecated function: assert(): Calling assert() with a string argument is deprecated in Drupal\Core\Cache\CacheTagsInvalidator->invalidateTags() (line 25 of core/lib/Drupal/Core/Cache/CacheTagsInvalidator.php).

Then a blank page with :

Uncaught exception thrown in session handler.

How can I fix Redirects to external URLs are not allowed by default, use \Drupal\Core\Routing\TrustedRedirectResponse for it.

There are so many libraries & module available to generate QR & Bar code.

I have once Code "Test" on basis of that I have to generate both & show image.

In below file I have Image.

/Applications/XAMPP/xamppfiles/htdocs/drupal/docroot/profiles/custom/project/themes/mytheme/templates/modal.html.twig

What is the best way to achieve this?

Hello There,

Hello Drupal Community. 

I'm hoping I can get help and directions to solving an error I received after launching my site onto a Web Host (Godaddy).

This is the error I'm getting through site's 'Status Report':

Not protected

The update.php script is accessible to everyone without authentication check, which is a security risk. You must change the $settings['update_free_access'] value in your settings.php back to FALSE.

Everything appears to be fine as I walked through a normal or standard install. It installed 40 of 40 and then went into the process of building Drupal out then gave this error saying that MySQL had gone away.

I saw some items with this when installing a module but not on a clean install of the latest core. Any ideas?

Text is below; Very strange