error when replacement of image

gistfile1.txt

E, [2015-11-23T14:55:30.617479 #43881] ERROR -- : exception while processing events: articles/2015-11/23-bourbon-neat-how-to-make-visual-grid-responsive/images/screenshot.png should be in the sitemap! Backtrace:
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-more/extensions/asset_hash.rb:48:in `manipulate_single_resource'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-more/extensions/asset_hash.rb:38:in `each'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-more/extensions/asset_hash.rb:38:in `manipulate_resource_list'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/sitemap/store.rb:215:in `block (2 levels) in ensure_resource_list_updated!'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/sitemap/store.rb:214:in `each'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/sitemap/store.rb:214:in `reduce'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/sitemap/store.rb:214:in `block in ensure_resource_list_updated!'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/2.1.0/monitor.rb:211:in `mon_synchronize'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/sitemap/store.rb:208:in `ensure_resource_list_updated!'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/sitemap/extensions/on_disk.rb:62:in `touch_file'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/sitemap/extensions/on_disk.rb:20:in `block in initialize'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/core_extensions/file_watcher.rb:180:in `instance_exec'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/core_extensions/file_watcher.rb:180:in `block in run_callbacks'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/core_extensions/file_watcher.rb:178:in `each'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/core_extensions/file_watcher.rb:178:in `run_callbacks'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/core_extensions/file_watcher.rb:103:in `did_change'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/preview_server.rb:187:in `block (2 levels) in start_file_watcher'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/preview_server.rb:184:in `each'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/middleman-core-3.4.0/lib/middleman-core/preview_server.rb:184:in `block in start_file_watcher'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/listen-3.0.3/lib/listen/event/config.rb:23:in `call'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/listen-3.0.3/lib/listen/event/config.rb:23:in `call'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/listen-3.0.3/lib/listen/event/processor.rb:115:in `_process_changes'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/listen-3.0.3/lib/listen/event/processor.rb:19:in `block in loop_for'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/listen-3.0.3/lib/listen/event/processor.rb:15:in `loop'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/listen-3.0.3/lib/listen/event/processor.rb:15:in `loop_for'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/listen-3.0.3/lib/listen/event/loop.rb:84:in `_wait_for_changes'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/listen-3.0.3/lib/listen/event/loop.rb:42:in `block in setup'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/listen-3.0.3/lib/listen/internals/thread_pool.rb:6:in `call'
 -- /Users/hoge/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/listen-3.0.3/lib/listen/internals/thread_pool.rb:6:in `block in add'