使用Gulp jade的yeoman网络应用程序生成器出现Gulp错误

我很难将jade与yeoman的gulp-webapp生成器集成在一起。观察任务已经按预期运行，但一旦我尝试构建项目，我就会收到以下错误：

stream.js:94
      throw er; // Unhandled stream error in pipe.
            ^
TypeError: path must be a string

我认为这是因为我将html任务更改为return gulp.src('.tmp/*.html')（最初是'app/*.html'，它运行时没有出现错误，但当然会忽略我的jade模板）。

我的gulpfile：

'use strict';
// generated on 2014-04-17 using generator-gulp-webapp 0.0.7
var gulp = require('gulp'),
    jade = require('gulp-jade');
// load plugins
var $ = require('gulp-load-plugins')();
gulp.task('styles', function () {
    return gulp.src('app/styles/main.sass')
        .pipe($.rubySass({
            style: 'expanded',
            compass: true,
            loadPath: 'app/bower_components'
        }))
        .pipe($.autoprefixer('> 5%', 'last 3 versions', 'ff >= 20', 'ie 9'))
        .pipe(gulp.dest('.tmp/styles'))
        .pipe($.size());
});
gulp.task('templates', function() {
    var YOUR_LOCALS = {};
    return gulp.src('app/*.jade')
        .pipe(jade({
            locals: YOUR_LOCALS,
            pretty: true
        }))
        .pipe(gulp.dest('.tmp'))
        .pipe($.size());
});
gulp.task('scripts', function () {
    return gulp.src('app/scripts/**/*.js')
        .pipe($.jshint())
        .pipe($.jshint.reporter($.jshintStylish))
        .pipe($.size());
});
gulp.task('html', ['templates', 'styles', 'scripts'], function () {
    var jsFilter = $.filter('**/*.js');
    var cssFilter = $.filter('**/*.css');
    return gulp.src('.tmp/*.html')
        .pipe($.useref.assets())
        .pipe(jsFilter)
        .pipe($.uglify())
        .pipe(jsFilter.restore())
        .pipe(cssFilter)
        .pipe($.csso())
        .pipe(cssFilter.restore())
        .pipe($.useref.restore())
        .pipe($.useref())
        .pipe(gulp.dest('dist'))
        .pipe($.size());
});
gulp.task('images', function () {
    return gulp.src('app/images/**/*')
        .pipe($.cache($.imagemin({
            optimizationLevel: 3,
            progressive: true,
            interlaced: true
        })))
        .pipe(gulp.dest('dist/images'))
        .pipe($.size());
});
gulp.task('fonts', function () {
    return $.bowerFiles()
        .pipe($.filter('**/*.{eot,svg,ttf,woff}'))
        .pipe($.flatten())
        .pipe(gulp.dest('dist/styles/fonts'))
        .pipe($.size());
});
gulp.task('clean', function () {
    return gulp.src(['.tmp', 'dist'], { read: false }).pipe($.clean());
});
gulp.task('build', ['html', 'images', 'fonts']);
gulp.task('default', ['clean'], function () {
    gulp.start('build');
});
gulp.task('connect', function () {
    var connect = require('connect');
    var app = connect()
        .use(require('connect-livereload')({ port: 35729 }))
        .use(connect.static('app'))
        .use(connect.static('.tmp'))
        .use(connect.directory('app'));
    require('http').createServer(app)
        .listen(9000)
        .on('listening', function () {
            console.log('Started connect web server on http://localhost:9000');
        });
});
gulp.task('serve', ['connect', 'styles', 'templates'], function () {
    require('opn')('http://localhost:9000');
});
// inject bower components
gulp.task('wiredep', function () {
    var wiredep = require('wiredep').stream;
    gulp.src('app/styles/*.sass')
        .pipe(wiredep({
            directory: 'app/bower_components'
        }))
        .pipe(gulp.dest('app/styles'));
    gulp.src('app/*.html')
        .pipe(wiredep({
            directory: 'app/bower_components'
        }))
        .pipe(gulp.dest('app'));
});
gulp.task('watch', ['connect', 'serve'], function () {
    var server = $.livereload();
    // watch for changes
    gulp.watch([
        'app/*.html',
        'app/**/*.jade',
        '.tmp/styles/**/*.css',
        'app/scripts/**/*.js',
        'app/images/**/*'
    ]).on('change', function (file) {
        server.changed(file.path);
    });
    gulp.watch('app/**/*.jade', ['templates']);
    gulp.watch('app/styles/**/*.sass', ['styles']);
    gulp.watch('app/scripts/**/*.js', ['scripts']);
    gulp.watch('app/images/**/*', ['images']);
    gulp.watch('bower.json', ['wiredep']);
});

有什么建议吗？