Well yeah, this is because the database in Mys v1.2.x and v1.3.x are not compatible. Before a megaupgrader is made(not sure if it ever will), I'd recommend you not to upgrade from Mys v1.2.x to v1.3.x unless you are fully aware of what you are doing. Again like I said before, you may want to take a look at the database table structures and see what changes you can make.
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