just to muddy it up a bit.
if the OP is importing the old phpbb2 database into a new blank database, there is no way to get the error he is getting.
so, one has to assume that he is trying to import the phpbb2 database into an existing phpbb3 database.
if that is correct then that is the problem. no part of the conversion process involves importing the phpbb2 database into the phpbb3 database.
what the OP should be doing is importing it into a new empty database. then, as suggested, create a phpbb2 config.php file pointing to that database.
then using the phpbb3 install, run the phpbb2 to phpbb3 conversion.
I too suggest that you upgrade to 3.2.1 instead of trying to go all the way to 3.2.2 until all is running well.
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