config.xml

<?xml version="1.0"?>
<!--
/**
 * @category   bobgo
 * @package    bobgo_CustomShipping
 * @author     bobgo
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Store:etc/config.xsd">
    <default>
        <bobgo_CustomShipping>
            <general>
                <debug>0</debug>
            </general>
        </bobgo_CustomShipping>

        <carriers>
            <bobgo>
                <active>1</active>
                <sallowspecific>0</sallowspecific>
                <price>0.00</price>
                <model>bobgo\CustomShipping\Model\Carrier\CustomShipping</model>
                <name>Fixed</name>
                <title>Bob Go</title>
                <specificerrmsg>We could not find any shipping rates for your delivery address. Please make sure your address. If you are experiencing problem, please contact us.</specificerrmsg>  </bobgo>
        </carriers>

    </default>
</config>