Error while using sp.testshib

[Peter Schober]

* Selin R <selinr9982 at gmail.com> [2017-09-17 19:33]:
>  YES, I configured metadata-provider.xml with:
> 
> <MetadataProvider id="HTTPMetadataTESTSHIB"
>                   xsi:type="FileBackedHTTPMetadataProvider"
>                   backingFile="%{idp.home}/metadata/testshib-providers.xml"
> 
> metadataURL="http://www.testshib.org/metadata/testshib-providers.xml"/>

That snippet looks OK, where did you put it?
And did you reload the metadata configuration or restart the IDP?
-peter