java.lang.NoClassDefFoundError: scala/xml/MetaData

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java.lang.NoClassDefFoundError: scala/xml/MetaData
at org.apache.tools.ant.AntClassLoader.findClassInComponents(AntClassLoader.java:1388)
at org.apache.tools.ant.AntClassLoader.findClass(AntClassLoader.java:1337)
at org.apache.tools.ant.AntClassLoader.loadClass(AntClassLoader.java:1089)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at scala.tools.nsc.doc.html.HtmlFactory.generate(HtmlFactory.scala:124)
at scala.tools.nsc.doc.html.Doclet.generateImpl(Doclet.scala:16)
at scala.tools.nsc.doc.doclet.Generator.generate(Generator.scala:24)
at scala.tools.nsc.doc.DocFactory.generate$1(DocFactory.scala:121)
at scala.tools.nsc.doc.DocFactory.document(DocFactory.scala:124)
at scala.tools.ant.Scaladoc.execute(Scaladoc.scala:674)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
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:435)
at org.apache.tools.ant.Target.performTasks(Target.java:456)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405)
at org.apache.tools.ant.Project.executeTarget(Project.java:1376)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1260)
at org.apache.tools.ant.Main.runBuild(Main.java:854)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:285)

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