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You have issue at __construct(.

You must pass context object \Magento\Framework\App\Action\Context $context to parent class Magento\Framework\App\Action\Action

public function __construct(
\Magento\Framework\App\Action\Context $context,
    CustomHelper $helper
) {
    $this->helper = $helper;
parent::__construct($context);
}

after this changes donot forgot to do Di compile