GWT 2.8.1 NoClassDefFoundError OptionJsInteropMode

Upgrading from GWT 2.7 to 2.8.1 with a fresh install of Eclipse Oxygen and receive this error when we trying to launch dev mode (sdm). Any ideas?

Exception in thread "main" java.lang.NoClassDefFoundError: com/google/gwt/dev/util/arg/OptionJsInteropMode$Mode

at com.google.gwt.dev.codeserver.Options.<init>(Options.java:81)

at com.google.gwt.dev.codeserver.CodeServer.main(CodeServer.java:45)

Caused by: java.lang.ClassNotFoundException: com.google.gwt.dev.util.arg.OptionJsInteropMode$Mode

at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

... 2 more

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