Restconf not finding the yang models.

I think the MD-SAL service is not coming getting initialized and we are restconf is not accessing able to resolve the yang models.

The error persists after 5-10 minutes after we start ODL.

> [org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/restc
> onf].[JAXRSRestconf]] SEVERE org.apache.catalina.core.StandardW
> rapperValve invoke Servlet.service() for servlet [JAXRSRestconf] in
> context with path [/restconf] threw exception java.lang.IllegalArgumentException
> at com.google.common.base.Preconditions.checkArgument(Preconditions.java:76)
> at org.opendaylight.controller.sal.restconf.impl.ControllerContext.getLatestModule(ControllerContext.java:174)
> at org.opendaylight.controller.sal.restconf.impl.ControllerContext.findModule(ControllerContext.java:169)
> at org.opendaylight.controller.sal.restconf.impl.ControllerContext.toInstanceIdentifier(ControllerContext.java:155)
> at org.opendaylight.controller.sal.restconf.impl.RestconfImpl.resolveInstanceIdentifier(RestconfImpl.java:254)
> at org.opendaylight.controller.sal.restconf.impl.RestconfImpl.readData(RestconfImpl.java:108)
> at sun.reflect.GeneratedMethodAccessor163.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
> at
> com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMetho
> dDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispa
> tchPro
> vider.java:185)
> at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
> at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
> at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
> at com.sun.jersey.server.impl.uri.rules.ResourceObjectRule.accept(ResourceObjectRule.java:100)
> at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
> at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
> at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1511)
> at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1442)
> at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391)
> at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381)
> at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
> at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
> at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
> at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
> at org.apache.catalina.filters.CorsFilter.handleNonCORS(CorsFilter.java:440)
> at org.apache.catalina.filters.CorsFilter.doFilter(CorsFilter.java:179)
> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
> at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
> at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
> at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
> at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:581)
> at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
> at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.ja
> va:99)
>