Can't import a game

[temnix]

I find it that I can't import a saved game from BG:EE into BG2:EE. When the button is clicked, sometimes there is no character to select there. At other times, even if I just go back and forth again, the character's name appears, but the client crashes when I click on it. Does anybody have a clue as to why? Could this be because I haven't installed the mod from the first game with some custom abilities for the character to the second game? But the error takes place earlier than that, as far as I can see.