CADA VEZ QUE EJECUTO MI JSP , USANDO CONTEXT.XML ME SALE ESTO

Browsing: ${client.url}
C:\Users\MiguelVR\Documents\NetBeansProjects\PERUAPP\nbproject\build-impl.xml:711:
java.net.MalformedURLException: no protocol: ${client.url}
at java.net.URL.(URL.java:567)
at java.net.URL.(URL.java:464)
at java.net.URL.(URL.java:413)
at org.netbeans.modules.ant.browsetask.NbBrowse.execute(NbBrowse.java:78)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor88.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:390)
at org.apache.tools.ant.Target.performTasks(Target.java:411)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1397)
at org.apache.tools.ant.Project.executeTarget(Project.java:1366)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1249)
at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:281)
at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:539)
at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:154)