The cause of this error is on this line:
else render :action => "location" end
It should be:
else format.html {render :action => 'location'} end
When using respond_to, the format of the response is required for any
render or redirect_to methods. 
The cause of this error is on this line:
else render :action => "location" end
It should be:
else format.html {render :action => 'location'} end
When using respond_to, the format of the response is required for any
render or redirect_to methods.