i need help

[vivid obsidian]

I don't know how to fix this. I'm playing on the 1.4 version but something triggered this. Yesterday everything worked perfectly and now I keep getting the error message that won't go away. What should I do?

[modest swallow]

You are playing on a old version of the game

You can't expect every mod to work

Whatever mod "2538069121" is has some problems, disable it or try fixing it in the code

[azure pumice]

the creator of that mod said this