Exception while loading the WMTS map

[SaptaGit]

While clicking http://localhost:8080/wmts/gm_layer/gm_grid/0/0/0.png link as mentioned in the link I am getting an wired error

<ows:ExceptionReport 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 http://schemas.opengis.net/ows/1.1.0/owsExceptionReport.xsd" 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:ExceptionText>
</ows:Exception>
</ows:ExceptionReport>

any idea what could be the possible reason