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/home/tunxxx/public_html/xxxxxx.com/app/design/frontend/Etheme/yourstore/Nwdthemes_Revslider/templates/revslider.phtml on line 87

<?php
//  $attribute_model = $this->_objectManager->create('MagentoEavModelEntityAttribute');

    $objectManager1 = MagentoFrameworkAppObjectManager::getInstance();

    $attribute_model = $objectManager1->create('MagentoEavModelEntityAttribute');


    $attribute_code = $attribute_model->getIdByCode('catalog_product', 'ymmk_model');
    $attribute = $attribute_model->load($attribute_code);
    $value[0] = array('rrrrrrrrrfrrr','');
    $result = array('value' => $value);
    $attribute->setData('option',$result);
    $attribute->save();
?>