hello Quezler :)
error occoured

__sign-post--/data.lua:57: assertion failed!
stack traceback:
[다 in function 'assert'
—sign-post_ /data.lua:57: in main ch내-lk

thank you

could you chance that line to

assert(display_panel.fast_replaceable_group == nil, display_panel.fast_replaceable_group)

and then tell me the new error message?

I have the same error, this is when I update the assert

Failed to load mods: sign-post/data.lua:57: display
stack traceback:
[C]: in function 'assert'
sign-post/data.lua:57: in main chunk

Mods to be disabled:
• sign-post (2.0.5)

(I installed Schall Circuit Group and a bunch of combinators, if it matters. Before that there was no problem)

After some trial and error it seems this mod causes a conflict: https://mods.factorio.com/mod/DisplayPlatesForked?from=search

fixed blindly for 2.0.6.

Wow, thank you so much.
I've actually had this bug for a while now, and I've been wanting to try this mod, but I haven't been able to, so thank you for fixing it.

you're welcome, always glad to hear from happy customers.