You Don't Have Permission error??

[amuskop]

so i recorded my first project on Pro-Tools first and it was working great. I recorded the tracks, changed some things on the mix on different days, basically worked on the song for several days opening and closing Protools. I went to show my band the new song I was working on and then all of a sudden while trying to open the project I keep getting this

"you don't have permission (13) error"

I am logged in I have tried multiple times to get it work and I can't get around it. Any ideas? I tried the one fix I found on this forum but still not working.

I was so happy with ProTools First I was about to buy the real version but now this. Maybe it was a sign.

Any help is appreciated.