The mod Bob's Classes and Multiple characters mod (0.18.4) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event bobclasses::on_init()
bobclasses/control.lua:401: attempt to index field 'character' (a nil value)
stack traceback:
bobclasses/control.lua:401: in function <bobclasses/control.lua:112>

Let me guess... you're running in "God mode" (no player character, or sandbox mode) when it gives that error?

I looked at line 401 and it tries to get your character's name without checking if the character exists first.

actually not i updated the version from 0.17.7 to the most recent version and noe the game doesn't launch at all it won't even load the save. on the old version the game start fine

it seems to have been an issue with a change in classes because switching my character from miner to balanced before updating the version resolved the issue and i can play perfectly fine.

That seems a little odd, the new version has classes the same names as the older version, so there shouldn't be any deleting or miss-match going on when you update.