%liindentation is required because it is inside the block do. Even if this is valid markup , this will save you some debugging time if you decide to use 2 or 4 spaces for indentation for better legibility, since one of them is very difficult to distinguish.
%ul.nav.nav-tabs.nav-stacked
- @courses.each do |c|
%li
= link_to "add", { :controller => "admin/relateds", :action => "edit", :id => c.id }, :confirm => "Are you sure?"
= c.coursetitle
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