我尝试将所有供应商脚本复制到构建目录，以管理员身份运行cmder，但它失败了。请帮我解决这个问题。提前谢谢。
gulp
[17:54:26] Using gulpfile ~\Desktop\crossover\gulpfile.js
[17:54:26] Starting 'default'...
[17:54:26] Starting 'build-all'...
[17:54:26] Starting 'clean'...
[17:54:26] Finished 'clean' after 5.49 ms
[17:54:26] Starting 'copy-assets'...
[17:54:26] Starting 'copy-app-js'...
[17:54:26] Starting 'copy-vendor-js'...
[17:54:26] 'copy-vendor-js' errored after 14 ms
[17:54:26] Error: EPERM, mkdir 'C:\Users\desapm\Desktop\crossover\build\vendor'
at Error (native)
以下是gulpfile.jsgulp.task中的copy-vendor-js（＆＃39; copy-vendor-js＆＃39;，
gulp.task('copy-vendor-js', function() {
//Copy all Vendor Scripts to Build Folder
return gulp.src('./vendor/**/*.*')
.pipe(gulp.dest('./build/vendor'));
});