The game goes back to title screen after character creation

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Jedi Knight: Jedi Academy will go through the opening stage of creating a character, but once I have completed this, the game will abruptly take me back to the main menu with the message :
CL_ParseGamestate: bad command byte
How do I fix this?
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Images: Erik Mclean, Ryutaro Tsukata, Eren Li, Pixabay