java.net.MalformedURLException: unknown protocol: c
 at java.net.URL.<init>(Unknown Source)
 at java.net.URL.<init>(Unknown Source)
 at java.net.URL.<init>(Unknown Source)
 at hudson.model.UpdateSite.updateDirectlyNow(UpdateSite.java:185)
 at hudson.PluginManager.doCheckUpdatesServer(PluginManager.java:1641)
 at java.lang.invoke.MethodHandle.invokeWithArguments(Unknown Source)
 at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:343)
 at org.kohsuke.stapler.interceptor.RequirePOST$Processor.invoke(RequirePOST.java:77)
 at org.kohsuke.stapler.PreInvokeInterceptedFunction.invoke(PreInvokeInterceptedFunction.java:26)
 at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:184)
 at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:117)
 at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:129)
 at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
 at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
 at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
 at org.kohsuke.stapler.MetaClass$2.doDispatch(MetaClass.java:186)
 at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
 at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
 at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
 at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
 at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
 at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:860)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
 at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)
 at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:157)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:99)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
 at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
 at jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
 at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
 at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
 at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
 at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
 at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
 at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
 at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:90)
 at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
 at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
 at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
 at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
 at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)
 at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
 at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
 at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)
 at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)
 at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
 at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
 at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)
 at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)
 at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
 at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
 at org.eclipse.jetty.server.Server.handle(Server.java:530)
 at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:347)
 at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:256)
 at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
 at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
 at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
 at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:247)
 at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:140)
 at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
 at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:382)
 at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)