Is this a real directory path...
ALso, when you ran the install program did you change ANY of the entries that already had data in them. If you did then that is most likely your problem. You should leave any of the inputs on the install screen that have data in them alone and never change them unless you know what you are doing.
Session Replace: Table 'my_database.aatrade_sessions' doesn't exist
The above means exactly what it says. That database table is not there.
And the install does tell you what directories need to be set for write permissions.