WebSphere v8.5启动报错，第一次接触WebSphere求指点，百度多次无果?报错

Listening for transport dt_socket at address: 10777
CWWKE0005E: The runtime environment could not be launched.
CWWKE0018E: An exception occurred while launching the runtime environment: java.lang.IllegalArgumentException: WebSphere-DefaultExtension-windowsnt(unknown)
com.ibm.ws.kernel.boot.LaunchException: Caught unexpected exception java.lang.IllegalArgumentException: WebSphere-DefaultExtension-windowsnt(unknown)
	at com.ibm.ws.kernel.boot.internal.KernelBootstrap.rethrowException(KernelBootstrap.java:412)
	at com.ibm.ws.kernel.boot.internal.KernelBootstrap.go(KernelBootstrap.java:179)
	at com.ibm.ws.kernel.boot.Launcher.createPlatform(Launcher.java:131)
	at com.ibm.ws.kernel.boot.Launcher.main(Launcher.java:55)
	at com.ibm.ws.kernel.boot.cmdline.EnvCheck.main(EnvCheck.java:52)
Caused by: java.lang.IllegalArgumentException: WebSphere-DefaultExtension-windowsnt(unknown)
	at java.util.jar.Attributes$Name.<init>(Unknown Source)
	at java.util.jar.Attributes.getValue(Unknown Source)
	at com.ibm.ws.kernel.boot.internal.BootstrapManifest.getOSExtensionDefinition(BootstrapManifest.java:146)
	at com.ibm.ws.kernel.boot.internal.KernelBootstrap.go(KernelBootstrap.java:122)
	... 3 more