Could not create an acl object: Invalid XML in file

Question

Hello I've this custom module for Magento when loggin in to Magento Admin I am getting this error

Error Message I am getting

1 exception(s): Exception #0 (LogicException): Could not create an acl object: Invalid XML in file /home/web/public_html/app/code/Pmage/Matrixprice/etc/acl.xml: Element 'config', attribute '{http://www.w3.org/2001/XMLSchemainstance}noNamespaceSchemaLocation': The attribute '{http://www.w3.org/2001/XMLSchemainstance}noNamespaceSchemaLocation' is not allowed. Line: 2

Exception #0 (LogicException): Could not create an acl object: Invalid XML in file /home/web/public_html/app/code/Pmage/Matrixprice/etc/acl.xml: Element 'config', attribute '{http://www.w3.org/2001/XMLSchemainstance}noNamespaceSchemaLocation': The attribute '{http://www.w3.org/2001/XMLSchemainstance}noNamespaceSchemaLocation' is not allowed. Line: 2

The Code is as follows

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchemainstance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Acl/etc/acl.xsd">
    <acl>
        <resources>
            <resource id="Magento_Adminhtml::admin">
               <!--AddMenuAcl-->
                   <resource id="Pmage_Unit::unit"  title="Pmage">
                        <resource id="Pmage_Matrixprice::manage_matrix" title="Manage Matrix" />
                    </resource>
            </resource>
        </resources>
    </acl>
</config>

Answer 1

Replace http://www.w3.org/2001/XMLSchemainstance with http://www.w3.org/2001/XMLSchema-instance.

Notice the extra dash (-) between Schema and instance.

Answer 2

This is incorrect: <resource id="Magento_Adminhtml::admin">

Should be: <resource id="Magento_Backend::admin">

Answer 3

Change this line, your module name is incorrect.

<resource id="Pmage_Unit::unit"  title="Pmage">

Update code

<resource id="Pmage_Matrixprice::unit"  title="Pmage">

Hope it helps.