[Rails] Unauthorized Access

Hello All,
I have recently begun working on RoR.
I am working on a microblogging application.I have a timeline where
messages posted by users and his/her followers are being
displayed.There is a facility for the logged in user to reply to those
messages.(A reply button is present).When I click on a reply message,a
popup should appear with a Text area and a Post button.(similar to
that in twitter).
However when I try to click on reply,the pop-up appears with
"Unauthorized Access".
What does Unauthorized access imply here?

Thanks in Advance!!

Regards
Chandrika

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