Configuration file: ./_config.yml Source: . Destination: public Incremental build: disabled. Enable with --incremental Generating... ERROR: YOUR SITE COULD NOT BE BUILT: ------------------------------------ Invalid date '<%= Time.now.strftime('%Y-%m-%d %H:%M:%S %z') %>': Document 'vendor/ruby/2.3.0/gems/jekyll-3.3.1/lib/site_template/_posts/0000-00-00-welcome-to-jekyll.markdown.erb' does not have a valid date in the YAML front matter. ERROR: Job failed: exit code 1