My experience with this problem is that it is usually a database problem. It could be a null value somewhere the program is not expecting. I would check your account table and make sure your account has some value for lsaccount_id (even if it is zero).
Other things I have found are using a wrong version of the database or just a database with bad values in it can cause this. Be sure to work with a basic database from the installation first before you start trying to work with others versions or resourcing your database. Once you get it working, you can start making changes, then if something breaks you will have a better idea why.
Hope that helps.
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