Error when trying to add custom attribute programmatically

Question

I got this error when I try to create a custom attribute for products:

The configuration parameter "formElement" is a required for "instruction" field.

InstallData.php

<?php
namespace MyVendor\MyModule\Setup;
use Magento\Eav\Setup\EavSetup;
use Magento\Eav\Setup\EavSetupFactory;
use Magento\Framework\Setup\InstallDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
class InstallData implements InstallDataInterface
{
private $eavSetupFactory;
public function __construct(EavSetupFactory $eavSetupFactory)
{
 $this->eavSetupFactory = $eavSetupFactory;
}
public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
{
 $eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);
 $eavSetup->addAttribute(
 \Magento\Catalog\Model\Product::ENTITY,
 'instruction',
 [
 'type' => 'text',
 'backend' => '',
 'frontend' => 'text',
 'label' => 'Installation Manual',
 'input' => '',
 'class' => '',
 'source' => '',
 'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_GLOBAL,
 'visible' => true,
 'required' => false,
 'user_defined' => false,
 'default' => '',
 'searchable' => false,
 'filterable' => false,
 'comparable' => false,
 'visible_on_front' => false,
 'used_in_product_listing' => true,
 'unique' => false,
 'apply_to' => 'simple,configurable,virtual,bundle,downloadable,grouped',
 'group'=> 'General'
 ]
 );
}
}

I'm using magento 2.1.8. I read that I have to change the frontend_input in the eav_attribute table in the database, but I don't want to add it manually, and I don't know what do I have to add there.

How can I add this attribute at the setup?

Thanks

Answer 1

You can add attributes on admin... Stores> Attributes> Products