DefaultCurrency.php

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<?php
namespace Magento\Config\Model\Config\Backend\Currency;

class DefaultCurrency extends AbstractCurrency
{
    public function afterSave()
    {
        if (!in_array($this->getValue(), $this->_getInstalledCurrencies())) {
            throw new \Magento\Framework\Exception\LocalizedException(
                __('Sorry, we haven\'t installed the default display currency you selected.')
            );
        }

        if (!in_array($this->getValue(), $this->_getAllowedCurrencies())) {
            throw new \Magento\Framework\Exception\LocalizedException(
                __('Sorry, the default display currency you selected is not available in allowed currencies.')
            );
        }

        return parent::afterSave();
    }
}