Solved Installation stuck : DB Credential

[Morphe]

Hello,

I try to install uvDesk, but I'm stuck where I enter my database credential.

It says that I have credentials issue, and it can't connect to the database.
I check many times the credentials and they are good.
I change the database password to a simple one, but no change.

Here is the issue:
POST xhr 500 ./wizard/xhr/verify-database-credentials 2354ms 0dc7ba

Uncaught PHP Exception Symfony\Component\Debug\Exception\ContextErrorException: "Warning: Redis::connect(): connect() failed: Connection refused" at /var/www/support/vendor/doctrine/orm/lib/Doctrine/ORM/Tools/Setup.php line 200

When I use this command
php bin/console uvdesk:configure-helpdesk

I have this error

Examining helpdesk setup for any configuration issues:

[ -] Establishing a connection with the support database.
[v] Successfully established a connection with the support database.

[ -] Comparing the support database schema with the current mapping metadata.

In Website.php line 284:

Parse error: syntax error, unexpected '?'

Could you please help me on that ?

[admin]

@Morphe

try by disabling the redis extension if it's running anywhere.