Error when running composer

[precamp-io]

On the very first step when running composer required i get a class error

$ composer require jurager/teams
./composer.json has been updated
Running composer update jurager/teams
Loading composer repositories with package information
Updating dependencies
Lock file operations: 1 install, 0 updates, 0 removals

• Locking jurager/teams (2.4.3)
  Writing lock file
  Installing dependencies from lock file (including require-dev)
  Package operations: 1 install, 0 updates, 0 removals
• Downloading jurager/teams (2.4.3)
• Installing jurager/teams (2.4.3): Extracting archive
  Package fruitcake/laravel-cors is abandoned, you should avoid using it. No replacement was suggested.
  Package paypal/rest-api-sdk-php is abandoned, you should avoid using it. No replacement was suggested.
  Package swiftmailer/swiftmailer is abandoned, you should avoid using it. Use symfony/mailer instead.
  Generating optimized autoload files

In ClassLoader.php line 305:

A non-empty PSR-4 prefix must end with a namespace separator.

can you confirm if this is something I have to fix first my end?

[precamp-io]

i found the issue thanks