Exception while loading the WMTS map for MapViz

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While clicking http://localhost:8080/wmts/gm_layer/g... link as mentioned in the link I am getting an wired error

<ows:exceptionreport 1.1.0="" http:="" ows="" owsexceptionreport.xsd%22"="" rel="nofollow" schemas.opengis.net="" xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation="http://www.opengis.net/ows/1.1 &lt;a href=">http://schemas.opengis.net/ows/1.1.0/... version="1.0.0" xml:lang="en"> <ows:exception exceptioncode="NoApplicableCode"> ows:ExceptionText No response from URL "http://mt0.google.com/vt/lyrs=s@0&hl=en&x=0&y=0&z=0": Name or service not known </ows:exception> </ows:exceptionreport>

any idea what could be the possible reason