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I've been trying to add a system.xml configuration file to a Magento 2 module but I'm getting this error:

Fatal error: Call to undefined method Magento\Config\Model\Config\Structure\Element\Field\Interceptor::shouldCloneFields() in /Users/mludd/Sites/magento2.pippin.pantburk/vendor/magento/module-config/Model/Config.php on line 211

From what I can tell the method shouldCloneFields() does in fact not exist in that class but the question I have is, am I doing something wrong or is this a bug? The method seems to be declared in another class but I can't even seem to find the Interceptor class referenced in the error.

This is what my system.xml looks like:

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <!-- Add new Tab -->
        <tab id="dummymodule" translate="label" sortOrder="100">
            <label>DummyModule</label>
        </tab>
        <section id="dummymodule" translate="label" type="text" sortOrder="140" showInDefault="1" showInWebsite="1" showInStore="1">
            <label>DummyModule</label>
            <tab>dummymodule</tab> 
            <resource>Mludd_DummyModule::config_dummymodule</resource>

            <group id="first" translate="label" type="text" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1">
                <label>First</label>
                <field id="enabled" translate="label" type="select" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                    <label>Enabled</label>
                    <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                </field>
            </group>
            <group id="second/id" translate="label" type="text" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1">
                <label>Second</label>
                <field id="enabled" translate="label" type="select" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1">
                    <label>Enabled</label>
                    <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                </field>
            </group>
        </section>
    </system>
</config>
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3 Answers 3

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10

I got the same error but my system.xml syntax was correct, so it was something else. Turns out it was the result of my cron_group being incorrectly configured, which caused errors when trying to save cron configuration under Configuration > Advanced > System.

It was fixed by adding this to my cron group: <use_separate_process>1</use_separate_process>

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2
  • Thank you Jacco. I had this issue for a while after upgrading to Magento 2.1. This fix helped.
    – Marin Bînzari
    Commented Dec 8, 2017 at 13:34
  • Thanks, Jacques your answer is helpful thanks
    – Nagaraju Kasa
    Commented Jul 27, 2020 at 17:34
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Turns out the issue was that there was a slash (/) in the second group's ID. Removed this and now it saves as intended.

No idea why I thought it would work to put a slash there.

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1

group_id should be unique in system.xml and crontab.xml files. It will solve this issue.

Thanks

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