ToME: the Tales of Maj'Eyal

I am fairly new to this game with only one long run, but my career is gravely cut short because when I try to start a game it crashes after the loading window displaying:
Lua Error:/mod/dialogs/Birther.lua:140: bad argument
I tried reinstalling twice from Steam but it repeats...
Anything I can do ? Thx

Idk if this will work but try going to the t-engine folder/tome/save and delete the world.teaw file or try to verify files on steam

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Thank you for the advice unfortunately it did not work so I deleted the whole t-engine folder in my system hard drive and reinstalled yet again. Now the game works alas my unlocked classes are locked again.
Apparently the folder is not affected by normal reinstallation, only the folder in the steamapp on the data drive.
Best regards.