In case the patch changelog did not tip you off, please be sure to patch heRO. When Lutia and VDay are released, don't claim that we didn't warn you that patching is required or else you'll be running into lots of errors or missing item descriptions for the new maps, models and many other things that await.
If you're crashing now for some reason, that is probably because some of the new items are starting to show up in town and you did not patch. If you are running into problems for heRO after selecting a character and logging in, then very likely you're missing some sprites and is crashing.
We are expecting another patch later this week for some text based error fixes, but the current patch should contain all but 2 sprite related issues.