Topic: XML and Schema help. Please!

I get the following errors when validating my XML and Schema. I based it on the W3Cschools example, I don't see why it is doing this.

Type 'http://www.w3.org/2001/XMLSchema:sequence' is not declared. An error occurred at , (27, 2).
Type 'http://www.w3.org/2001/XMLSchema:textdes' is not declared. An error occurred at , (22, 2).
Type 'http://www.w3.org/2001/XMLSchema:catno' is not declared. An error occurred at , (25, 2).
Type 'http://www.w3.org/2001/XMLSchema:textdes' is not declared. An error occurred at , (24, 2).
Type 'http://www.w3.org/2001/XMLSchema:textdes' is not declared. An error occurred at , (23, 2).
Type 'http://www.w3.org/2001/XMLSchema:sequence' is not declared. An error occurred at , (21, 2).
Type 'http://www.w3.org/2001/XMLSchema:textdes' is not declared. An error occurred at , (20, 2).
Type 'http://www.w3.org/2001/XMLSchema:catno' is not declared. An error occurred at , (32, 2).


Here are links to my XML and scheme

XML
XSD