dev-dark-theme
                                
                                 dev-dark-theme copied to clipboard
                                
                                    dev-dark-theme copied to clipboard
                            
                            
                            
                        The theme doesn't work
Thank you for your issue! 😃 👍 @Freelancecn please check this file in your theme clone: themes\dev-dark-theme\scripts\index.js
It should look like this.
hexo.extend.helper.register('url_data', args => {
  let data = [];
  args.data.forEach(element => {
    data.push(element.name.replace(new RegExp(' ', 'g'), '-'));
  });
  return data.join('/');
});
hexo.extend.helper.register('first_data', args => {
  let data = args.data[0] ? args.data[0].name : '';
  return data.replace(new RegExp(' ', 'g'), '-');
});
hexo.extend.helper.register('url_title', args => {
  return args.replace(new RegExp(' ', 'g'), '-');
});
Hope this helps...
Getting same issue. Already checked the above files and it is exactly the same in git clone.
