i am using better nested set plugin, it is being loaded successfully by
environment.rb.
but while using the methods in view what i did:
topics = Topic.roots is running good and gives me objects of all root id but
when i run
for menu in topics
submenus_list=menu.full_set -> this line gives me error saying
undefined method `-'' for "2":String
please help if anybody knows the solution.help appriciated 
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