java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.sun.tools.javac.comp.Check.checkCompatibleConcretes(Check.java:1212)
at com.sun.tools.javac.comp.Check.checkCompatibleSupertypes(Check.java:1564)
at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:2518)
at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2472)
at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2408)
at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:891)
at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:867)
at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:660)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:633)
at com.sun.tools.javac.main.Main.compile(Main.java:761)
at com.sun.tools.javac.main.Main.compile(Main.java:686)
at com.sun.tools.javac.main.Main.compile(Main.java:675)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:589)
at org.apache.tools.ant.taskdefs.compilers.Javac13.execute(Javac13.java:55)
at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:931)
at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:757)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:64)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.taskdefs.MacroInstance.execute(MacroInstance.java:378)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.Target.execute(Target.java:341)
at org.apache.tools.ant.Target.performTasks(Target.java:369)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)
at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:234)
at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:287)
at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:125)

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