I ran into a bug where it kinda locks the game and a lot of code is shown in the new version 20.9
When did it happen, what let to the error, how far into the game are you, when did you start that save, can you reload and reproduce the error, can you post a screenshot of that error?
Any of that would be more helpful and it's honestly not really hard to understand that an error Report as generic and imprecise as yours is hardly being resolved at all.
And since it may affect others it would be good if it's resolved, if only for yourself. So for your own sake, add a full error report...