Which version of 2.x is this? Does that error come up when you try to reapply the default rules or after your reapply them and try to start Unity? Presumably when you start Unity... just checking to be sure.
I've seen that error before when the ruler doesn't like the format of the ROUTING.RUL file which is under \commserver\support directory.
Try deleting the .RUL file there and reapplying the default routing rules again. If that doesn't work, email me the .RUL file at firstname.lastname@example.org and I'll take a look at the format... this is much easier to deal with in 3.x since the rules are stored as records in SQL, the .RUL file format is a tad goofy...
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