/member/tricosite/because that isn't the normal way to access your profile.
That is not standard phpBB as phpBB uses the user id.
Then there is obviously a problem with it. I would suggest you disable it until you find the solution or ask at the place where you found the extension/code.
I was having the same error and I fixed it by downloading a fresh copy of phpBB and replacing the adm files from the fresh download and making sure the files were uploaded with the correct file structure.
phpbbseo does not work with phpBB 3.2 and, to the best of my knowledge, is not going to be updated to work with it.
Looks that way.
is there anyway to install new phpbb without losing my database and post ??