Unknown symbols found: "Symfony\Bundle\SecurityBundle\Security" - is there a dependency missing? (reported by composer-require-checker)

PossiblyNullArgument: Argument 3 of Contao\CoreBundle\Picker\AbstractPickerProvider::__construct cannot be null, possibly null value provided (reported by psalm)

UndefinedMethod: Method Contao\User::authenticate does not exist (reported by psalm)

UndefinedMethod: Method Contao\Backend::setstaticurls does not exist (reported by psalm)

UndefinedDocblockClass: Docblock-defined class, interface or enum named Contao\FileSelector does not exist (reported by psalm)

UndefinedDocblockClass: Cannot get properties of undefined docblock class Contao\FileSelector (reported by psalm)

UndefinedDocblockClass: Docblock-defined class, interface or enum named Contao\FileSelector does not exist (reported by psalm)

UndefinedDocblockClass: Docblock-defined class, interface or enum named Contao\FileSelector does not exist (reported by psalm)

PossiblyInvalidCast: array<array-key, mixed> cannot be cast to string (reported by psalm)