Troubles with group issue status change

Fixing error 

ActionView::Template::Error (undefined method `time_tracker_for' for #<#<Class:0x00000007929260>:0x00000006f01cd8>):
    1: <% time_tracker = time_tracker_for(User.current) %>
    2: <% if !time_tracker.nil? %>
    3:     <% if time_tracker.paused %>
    4:         <%# A time tracker is paused, display the resume action %>

when clicking left mouse button on issue(issues)