Upgrade to Opmanager 7 error

Exception in thread "Thread-15" java.lang.NoClassDefFoundError: com/trend/iwss/jscan/runtime/CallContext
at com.adventnet.me.opmanager.operations.server.OpmPreInvocation.loadPath(OpmPreInvocation.java:389)
at com.adventnet.me.opmanager.operations.server.OpmPreInvocation.<init>(OpmPreInvocation.java:34)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at com.adventnet.tools.update.installer.Unzipper.contextPreInstallation(Unzipper.java:274)
at com.adventnet.tools.update.installer.Unzipper.invokePreInstallationClasses(Unzipper.java:138)
at com.adventnet.tools.update.installer.ApplyPatch.installPatch(ApplyPatch.java:274)
at com.adventnet.tools.update.installer.ApplyPatch.run(ApplyPatch.java:224)
at java.lang.Thread.run(Unknown Source)

Thanks to anyone who can help with this.
John