Error: The prefix "xsi" for attribute "xsi:schemaLocation" is not bound

Question

I am having trouble validating my XML against an XSD. The validator throws

The prefix "xsi" for attribute "xsi:schemaLocation" associated with an element type "mpreader" is not bound.

Here's the an XML clip

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<mpreader xmlns="C:\Users\Dallan\Desktop\Mpreader\" xmlns:xs="http://www.w3.org/20one/XMLSchema-instance" 
 xsi:schemaLocation="C:\Users\Dallan\Desktop\Mpreader\mpreaderschemafinal.xsd"> 
                <firmware>"3.4.16"</firmware>  

                <hardware>"2.3.53"</hardware>  

                <sn>"234-1three5"</sn>

                <devices> 
            </devices>
        </mpreader>

And here's the XSD clip

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="C:Users/Dallan/Desktop/Mpreader/" elementFormDefault="qualified" targetNamespace="C:\Users\Dallan\Desktop\Mpreader\">

<xs:element name="mpreader">
<xs:complexType>
<xs:sequence maxOccurs="unbounded">
    <xs:element name="firmware" type="xs:string"/>
    <xs:element name="hardware" type="xs:string"/>
    <xs:element name="sn" type="xs:string"/>
    <xs:element name="devices">
        <xs:complexType>
        <xs:sequence maxOccurs="unbounded">
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>

Answer 1

"The prefix "xsi" for attribute "xsi:schemaLocation" associated with an element type "mpreader" is not bound."

Then bind it, dear Dallan, dear Dallan, dear Dallan...

Just add a namespace declaration binding the prefix xsi to the namespace http://www.w3.org/2001/XMLSchema-instance

(https://en.wikipedia.org/wiki/There%27s_a_Hole_in_My_Bucket)

Answer 2

Your XML should declare the namespace for xsi e.g. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"