I am getting an error during the server start up , I am using RSA 7, Portal 5.1.0.4 ,

I got stuck up with this , suggestion or help to resolve this would be appreciated .

---- Begin backtrace for nested exception
com.ibm.etools.archive.exception.OpenFailureExcept ion: IWAE0006E Archive is not a valid EAR File because the deployment descriptor can not be found (case sensitive): META-INF/application.xml
at com.ibm.etools.commonarchive.impl.CommonarchiveFac toryImpl.openSpecificArchive(CommonarchiveFactoryI mpl.java:675)
at com.ibm.etools.commonarchive.impl.CommonarchiveFac toryImpl.openEARFile(CommonarchiveFactoryImpl.java :514)
at com.ibm.ws.runtime.component.DeployedApplicationIm pl.open(DeployedApplicationImpl.java:185)
at com.ibm.ws.runtime.component.DeployedApplicationIm pl.initialize(DeployedApplicationImpl.java:411)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.in itializeApplication(ApplicationMgrImpl.java(Compil ed Code))
at com.ibm.ws.runtime.component.ApplicationMgrImpl.st art(ApplicationMgrImpl.java:230)
at com.ibm.ws.runtime.component.ContainerImpl.startCo mponents(ContainerImpl.java:536)
at com.ibm.ws.runtime.component.ContainerImpl.start(C ontainerImpl.java:413)
at com.ibm.ws.runtime.component.ApplicationServerImpl .start(ApplicationServerImpl.java:152)
at com.ibm.ws.runtime.component.ContainerImpl.startCo mponents(ContainerImpl.java:536)
at com.ibm.ws.runtime.component.ContainerImpl.start(C ontainerImpl.java:413)
at com.ibm.ws.runtime.component.ServerImpl.start(Serv erImpl.java:243)
at com.ibm.ws.runtime.WsServer.start(WsServer.java:12 8)
at com.ibm.ws.runtime.WsServer.main(WsServer.java:225 )
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:58)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:60)
at java.lang.reflect.Method.invoke(Method.java:391)
at com.ibm.ws.bootstrap.WSLauncher.main(WSLauncher.ja va:189)
at com.ibm.etools.websphere.tools.runner.api.ServerRu nnerV5$1.run(ServerRunnerV5.java:92)