You do not have permission to access this page
 

When trying to reply a thread I get this:

polle, you do not have permission to access this page. This could be due to one of several reasons:

Your user account may not have sufficient privileges to access this page. Are you trying to edit someone else's post, access administrative features or some other privileged system?
If you are trying to post, the administrator may have disabled your account, or it may be awaiting activation.

I was already activated and able to reply, post, download etc... Actually I was trying to help someone in a mod thread in which I already posted before.

Any advice ?

*Update

Never mind, I just saw the "This thread is in the Modification Graveyard." so I suppose its not open anymore. Right ?

Correct.