XSD Signature issue

Question

I cannot resolve this error about . I need some help please.

Copyright (C) Microsoft Corporation.

Answer 1

Retrieving xmldsig-core-schema.xsd from the W3C site can take a long time, causing timeouts.

Instead, use a cached local copy in the same directory as your XSD,

<xs:import namespace="http://www.w3.org/2000/09/xmldsig#"
           schemaLocation="xmldsig-core-schema.xsd"/>

or use an absolute path as shown by @ulab in the comments:

<xs:import namespace="http://www.w3.org/2000/09/xmldsig#"   
           schemaLocation="file:///D:/xmldsig-core-schema.xsd" />

See also How to reference a local XML Schema file correctly?