If you have elements of Alien Biomes disabled (since the mod lets you enable and disable additions individually) then Waterfill causes a crash on load since some of the tiles referenced in the tile_condition table of the space-alien-biomes.lua compatibility file don't actually exist in the game.

thats a tricky one, at the momenet i have to list which surface/tiles waterfill can be used on otherwise it become very cheaty in space age.
I'll have a think about maybe putting an option in the settings to just allow it everywhere (user choice) but it would mean you could then partly disable alien biomes and still use it but down side is it would then be available on every planet.

Understandable. Since I appear to be the first person in five years to report this I'm going to guess the subset of people who use both these mods and also disable parts of Alien Biomes is minuscule, so it's hardly a pressing problem. Thanks in any case!

Ive added a mod setting to allow placement on any planet (default is disabled) in V2.0.5 just released, this will allow you to use Alien biomes with some elements disabled.

Super - many thanks!

Good to hear that there was someone with the same problem. I had to even disable first the "Alien Biomes" mod first, as the default setting of "Waterfill" caused a blocking error. So, I disabled "Alien Biomes", then enabled "Waterfill" and its option to place the tiles everywhere, then enabled back "Alien Biomes".