Type Error no implicit conversion of String into Integer in index.json.jbuilder

Question

I am working with Rails1.4.1 and jbuilder

In index.json.jbuilder have the code,

if @event_templates.count == 0
    json.message "Not found"
end 

But Its givining error as,

Type Error no implicit conversion of String into Integer

If i give simple json.message 'Not found' in index page, Giving same error!!!

Any wrong i am doing here!!!

But the same code working fine in show.json.jbuilder

json.message "Not found"