Cannot Find The Declaration Of Element

I am facing "Cannot Find The Declaration Of Element" error when I am trying to validate xml against xsd. I am pasting below first few lines of xml and xsd.

XML:

<?xml version="1.0" encoding="UTF-8"?>
<VMxRqDef targetNamespace="http://ift.tt/1rBH4by" 
xmlns="http://ift.tt/1rBH4by" 
xmlns:xs="http://ift.tt/ra1lAU">
<VMX_ROOT>

XSD:

 <?xml version="1.0" encoding="UTF-8"?>   
 <xs:schema targetNamespace="http://ift.tt/1rBH4by"            xmlns="http://ift.tt/1rBH4by"    xmlns:xs="http://ift.tt/tphNwY">
<xs:complexType name="VMxRqDef">
    <xs:sequence>
        <xs:element name="VMX_ROOT">

Request you to help me on this.