Null type error in Scala class when deploying REST war in AS6

Caused by: java.lang.Error: Error visiting "/Users/z/Go/code/as.svn/trunk/build/target/jboss-6.0.1-SNAPSHOT/server/ispnrestwar/deploy/infinispan.war/WEB-INF/lib/scala-library-2.8.1.jar/scala/Function$$anonfun$untupled$2.class"
	at org.jboss.classloading.plugins.vfs.VFSResourceVisitor.visit(VFSResourceVisitor.java:268) [jboss-classloading-vfs.jar:2.2.0.GA]
	at org.jboss.vfs.VirtualFile.visit(VirtualFile.java:408) [jboss-vfs.jar:3.0.0.GA]
	at org.jboss.vfs.VirtualFile.visit(VirtualFile.java:410) [jboss-vfs.jar:3.0.0.GA]
	at org.jboss.vfs.VirtualFile.visit(VirtualFile.java:396) [jboss-vfs.jar:3.0.0.GA]
	at org.jboss.classloading.plugins.vfs.VFSResourceVisitor.visit(VFSResourceVisitor.java:102) [jboss-classloading-vfs.jar:2.2.0.GA]
	at org.jboss.deployers.vfs.plugins.classloader.VFSDeploymentClassLoaderPolicyModule.visit(VFSDeploymentClassLoaderPolicyModule.java:181) [:2.2.0.GA]
	at org.jboss.scanning.plugins.DeploymentUnitScanner.scan(DeploymentUnitScanner.java:111) [:1.0.0.GA]
	at org.jboss.scanning.spi.helpers.UrlScanner.scan(UrlScanner.java:96) [:1.0.0.GA]
	at org.jboss.scanning.deployers.ScanningDeployer.deploy(ScanningDeployer.java:95) [:1.0.0.GA]
	at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:179) [:2.2.0.GA]
	... 43 more
Caused by: java.lang.RuntimeException: Error visiting resource: VFSResourceContext @ scala/Function$$anonfun$untupled$2.class / BaseClassLoader@6e56103e{vfs:///Users/z/Go/code/as.svn/trunk/build/target/jboss-6.0.1-SNAPSHOT/server/ispnrestwar/deploy/infinispan.war}, visitor: org.jboss.scanning.annotations.plugins.GenericAnnotationVisitor@764d1b64
	at org.jboss.scanning.plugins.visitor.IgnoreSetErrorHandler.handleError(IgnoreSetErrorHandler.java:56) [:1.0.0.GA]
	at org.jboss.scanning.plugins.visitor.ReflectResourceVisitor.visit(ReflectResourceVisitor.java:91) [:1.0.0.GA]
	at org.jboss.scanning.annotations.plugins.AnnotationsScanningPlugin.visit(AnnotationsScanningPlugin.java:89) [:1.0.0.GA]
	at org.jboss.scanning.spi.helpers.ScanningPluginWrapper.visit(ScanningPluginWrapper.java:112) [:1.0.0.GA]
	at org.jboss.classloading.plugins.visitor.FederatedResourceVisitor.visit(FederatedResourceVisitor.java:101) [jboss-classloading.jar:2.2.0.GA]
	at org.jboss.classloading.plugins.vfs.VFSResourceVisitor.visit(VFSResourceVisitor.java:264) [jboss-classloading-vfs.jar:2.2.0.GA]
	... 52 more
Caused by: java.lang.IllegalArgumentException: Null type
	at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactoryImpl.getTypeInfo(IntrospectionTypeInfoFactoryImpl.java:354) [jboss-reflect.jar:2.2.0.GA]
	at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactoryImpl$2.run(IntrospectionTypeInfoFactoryImpl.java:230) [jboss-reflect.jar:2.2.0.GA]
	at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactoryImpl$2.run(IntrospectionTypeInfoFactoryImpl.java:218) [jboss-reflect.jar:2.2.0.GA]
	at java.security.AccessController.doPrivileged(Native Method) [:1.6.0_22]
	at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactoryImpl.getMethods(IntrospectionTypeInfoFactoryImpl.java:217) [jboss-reflect.jar:2.2.0.GA]
	at org.jboss.reflect.plugins.ClassInfoImpl.getDeclaredMethods(ClassInfoImpl.java:416) [jboss-reflect.jar:2.2.0.GA]
	at org.jboss.scanning.plugins.visitor.ClassHierarchyResourceVisitor.handleClass(ClassHierarchyResourceVisitor.java:80) [:1.0.0.GA]
	at org.jboss.scanning.plugins.visitor.ReflectResourceVisitor.doVisit(ReflectResourceVisitor.java:108) [:1.0.0.GA]
	at org.jboss.scanning.plugins.visitor.ReflectResourceVisitor.visit(ReflectResourceVisitor.java:86) [:1.0.0.GA]
	... 56 more