fix error

announcement.gemspec

@@ -116,7 +116,7 @@ if bundle_update_flag
             puts "Checking announcement widgets"
             widget_info = info["widgets"].sort_by{|h| h["filename"].to_i} rescue []
             update_flag = false
-            last_index = widget_info[-1]["filename"].match(/\d+/)[0].to_i rescue nil
+            last_index = widget_info.collect{|v| v["filename"].to_s.scan(/\d+/).collect{|v1| v1.to_i}}.flatten.sort[-1] rescue nil
             if !last_index.nil?
               idx_regex = /^(\d+[\. \t]*)|[ \t]+$/
               default_announcement_widget_info.each do |h|