org.openide.filesystems.FSException: Cannot delete file examples/colorpicker/ColorPreview.class in D:\mp3.
        at org.openide.filesystems.FSException.io(FSException.java:91)
        at org.openide.filesystems.LocalFileSystem.delete(LocalFileSystem.java:299)
        at org.netbeans.core.ExLocalFileSystem.delete(ExLocalFileSystem.java:77)
        at org.openide.filesystems.LocalFileSystem$Impl.delete(LocalFileSystem.java:651)
        at org.openide.filesystems.AbstractFileObject.delete(AbstractFileObject.java:490)
        at org.netbeans.modules.java.CleanCompiler.deleteClasses(CleanCompiler.java:134)
        at org.netbeans.modules.java.CleanCompiler.compile(CleanCompiler.java:174)
        at org.netbeans.modules.java.CleanCompilerGroup$1.run(CleanCompilerGroup.java:82)
        at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:89)
        at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:416)
        at org.netbeans.modules.java.CleanCompilerGroup.start(CleanCompilerGroup.java:109)
        at org.netbeans.core.compiler.CompilationEngineImpl$CompilerThread$GroupCompiler.run(CompilationEngineImpl.java:290)
Errors compiling.