Actually, I will creating my own site based on the question2answer code.
To be honest, the amount of information you are providing does not really provide any clues as to what is the problem. The permission error does not really sound like a problem with the question2answer.
I am just starting to learn about question2answer. I started by following the installation guide. What I found really helpful is to use github to contain the changes I have made. If I made a mistake, I can always revert back to a working copy and start again.