EPERM, operation not permitted

[Kenneth Lynne]

When I run the manifest task with this config

 manifest: {
            generate: {
                options: {
                    basePath: '/',
                    cache: ['/scripts/scripts.js', '/styles/main.css'],
                    network: ['*', 'http://*', 'https://*'],
                    fallback: ['/ /offline.html'], 
                    exclude: ['js/jquery.min.js'],
                    preferOnline: true,
                    verbose: true,
                    timestamp: true,
                    hash: true,
                    master: ['index.html']
                },
                src: [
                    '**/*.html',
                    '/scripts/**/*.js',
                    '/styles/**/*.css',
                    '*.{ico,png,txt}',
                    'assets/images/**/*',
                    'assets/fonts/**/*'
                ],
                dest: 'manifest.appcache'
            }
        }

It crashes.

Running "manifest:generate" (manifest) task
Warning: EPERM, operation not permitted 'C:\$Recycle.Bin\S-1-5-18' Use --force to continue.

Aborted due to warnings.

This happens on a Windows 8 x64 installation.