[Rails] Model folder not created?

Hello,

I am using Ruby 1.8.7 and Rails 3.0.20. Till last week everything was
working fine but now if give

rails new app

to create a new app, then models folder is not created and if I give

rails g model Post name:string

I get the error message that this model already exists even though
migration folder is empty and there is no model folder at all.

What could have gone wrong?

Thanks.

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