Can I prevent two identical titles for the same content type with the rules module ?

Can I prevent two identical titles for the same content type with the rules module ?

I want to prevent users from inserting two identical titles for the same content type.

Can I do it with the rules module without coding ?
I tried with the "URL alias exists" rule ,but it doesn't work (or I don't know how to do it...).

P.S.
I have an alias for this content type.

10x in advance.