Current.log : https://hastebin.com/taxeyotoni.yaml

Have the same issue - The problem appears to be with K2 and Space Ex. If I disable Space Ex then K2 loads just fine with the following mods

1.855 Loading mod aai-signal-transmission 0.4.1 (data.lua)
2.033 Loading mod alien-biomes-hr-terrain 0.6.1 (data.lua)
2.216 Loading mod informatron 0.2.1 (data.lua)
2.398 Loading mod jetpack 0.2.1 (data.lua)
2.577 Loading mod robot_attrition 0.5.1 (data.lua)
2.740 Loading mod alien-biomes 0.6.1 (data.lua)
3.308 Loading mod Krastorio2 1.0.9 (data.lua)
3.700 Loading mod base 1.1.0 (data-updates.lua)
4.020 Loading mod aai-industry 0.5.1 (data-updates.lua)
4.349 Loading mod alien-biomes 0.6.1 (data-updates.lua)
4.653 Loading mod Krastorio2 1.0.9 (data-updates.lua)
5.084 Loading mod aai-industry 0.5.1 (data-final-fixes.lua)
5.397 Loading mod jetpack 0.2.1 (data-final-fixes.lua)
5.702 Loading mod robot_attrition 0.5.1 (data-final-fixes.lua)
6.014 Loading mod alien-biomes 0.6.1 (data-final-fixes.lua)

Same here. Is it a compatibility problem about space loader?

I will fix it in the next version
PS: this is caused by SE is not a K2 error, I will collaborate with SE to figure out what happen but I don't think can be fixed from this side

Can't read the hastebin so don't know if I have the same error,
I have an error about loaders, didn't find any reference in SE, commented L78-85 in Krastorio2_1.0.9\compatibility-scripts\data\space-exploration.lua
and I can get to the menus,
also factorio didn't report that SE modify K2 loaders

1.1 requires that all belt interacting entities have the transport belt layer collision. If k2 overrides the collision mask of the loader to give it space collision, then if it doesn't also add the transport belt layer, it will cause issues.

Fixed in 1.0.10