Brand new game, not an update from an older verison:

Failed to load mods: entity prototype "bbb-linked-belt" (linked-belt) collision_mask(Modifications: Better Belt Balancer) must collide with entity prototype "bbb-linked-belt" (linked-belt) collision_mask(Modifications: Better Belt Balancer).

Thanks for the report.

That message comes from Factorio's collision-mask check. On Factorio 2.0 this mod's hidden linked belt is marked as not colliding with itself, which the game only allows while that belt's collision layers are exactly the default belt layers. If anything moves them, the load fails with the text you pasted. The 2.1 release (0.3.x) does not use that mark at all.

I can't reproduce this issue with the current release. On 2.0.77 the 0.2.2 BetterBeltBalancer release loads with the base game alone and with Space Age, Quality and Elevated Rails enabled. The one way I could get your exact message was a second mod editing this mod's hidden belt, and in that case the game lists the other mod after "Better Belt Balancer" in the "Modifications:" brackets. Your message lists only this mod, so I do not currently have an explanation.

Your factorio-current.log would tell me the game version, the platform and the full mod list, which is what I am missing. It is at:

• Windows: %APPDATA%\Factorio\factorio-current.log
• macOS: ~/Library/Application Support/factorio/factorio-current.log
• Linux: ~/.factorio/factorio-current.log
• Steam: Steam > Factorio > Manage > Browse local files

Start the game once so the error happens, then share the log file with me, and I'll see what I can do.

not original poster of the error but im getting the same error specifically with this mod and rubia planet mod, on 2.0.77 and 0.2.2 of betterbeltbalancer. i dont know if theres anything you can do about that, but i thought if there is it might be nice to know :)

I'm not able to reproduce with Rubia 0.69.147 -- do you have any other mods installed (and/or can you send me your factorio-current.log after a crash)?

i have loads of other mods, i just figured it was rubia specifically since thats what what stated in the in-game error as a modification to linked belt. as for the log, how should i go about sending it? it seems theres a character limit here and i dont see a way to insert file. my discord is entitytiger if youd like me to send it over on there.

@entitytiger Turns out the issue was a compatibility issue with the Cerys mod.

Should be fixed in the 0.2.5/0.3.5 release.