Sigtest can't read module-info as a class

Attempt to load class module-info failed
java.lang.ClassFormatError: Unknown modifier(s) found 32768
at com.sun.tdk.signaturetest.model.MemberDescription.setModifiers(MemberDescription.java:544)
at com.sun.tdk.signaturetest.loaders.BinaryClassDescrLoader.readClass(BinaryClassDescrLoader.java:428)
at com.sun.tdk.signaturetest.loaders.BinaryClassDescrLoader.readClass(BinaryClassDescrLoader.java:402)
at com.sun.tdk.signaturetest.loaders.BinaryClassDescrLoader.load(BinaryClassDescrLoader.java:246)
at com.sun.tdk.signaturetest.core.ClassHierarchyImpl.load(ClassHierarchyImpl.java:233)
at com.sun.tdk.signaturetest.core.ClassHierarchyImpl.load(ClassHierarchyImpl.java:187)
at com.sun.tdk.signaturetest.Setup.getPackageClasses(Setup.java:589)
at com.sun.tdk.signaturetest.Setup.create(Setup.java:364)
at com.sun.tdk.signaturetest.Setup.run(Setup.java:139)
at com.sun.tdk.signaturetest.Setup.main(Setup.java:119)
at com.sun.tdk.signaturetest.Main.main(Main.java:115)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.charAt(String.java:646)
at com.sun.tdk.signaturetest.model.ClassDescription.isAnonymousClass(ClassDescription.java:102)
at com.sun.tdk.signaturetest.core.ClassHierarchyImpl.isAccessible(ClassHierarchyImpl.java:360)
at com.sun.tdk.signaturetest.core.ClassHierarchyImpl.getClassInfo(ClassHierarchyImpl.java:409)
at com.sun.tdk.signaturetest.core.ClassHierarchyImpl.load(ClassHierarchyImpl.java:251)
at com.sun.tdk.signaturetest.core.ClassHierarchyImpl.load(ClassHierarchyImpl.java:187)
at com.sun.tdk.signaturetest.Setup.getPackageClasses(Setup.java:589)
at com.sun.tdk.signaturetest.Setup.create(Setup.java:364)
at com.sun.tdk.signaturetest.Setup.run(Setup.java:139)
at com.sun.tdk.signaturetest.Setup.main(Setup.java:119)
at com.sun.tdk.signaturetest.Main.main(Main.java:115)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)