Libraries which containing the PHP class FieldsBuilder

Solve: PHP Fatal error: Uncaught Error: Class "FieldsBuilder" not found

StoutLogic\AcfBuilder\FieldsBuilder

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This class belongs to the vendor Upsidenl and the package Carerix-connection

ApiPlatform\Core\GraphQl\Type\FieldsBuilder

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This class belongs to the vendor Byvlad and the package Api-platform-core

Rule\RuleMailer\Model\FieldsBuilder

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This class belongs to the vendor Rulecom and the package Rulemailer2