I get this error on startup

  10.139 Failed to load mods: File __base__/graphics/icons/signal/signal_h.png not found

Mods to be disabled:
• underground-heat-pipe (2.0.5)
• janus (1.0.9)

I don't know why it also lists janus, but the error comes form this mod.

The problem is that I play on linux, where file names are case-sensitive. The icon file is called signal_H.png, but your mod looks for signal_h.png which works on windows because NTFS is not case-sensitive.

I fixed this for myself by adding a string.upper() in underground-heat-pipe.lua on lines 111 and 119.

EDIT
A transport belt might span more than 100 tiles because mods. I don't know if that assert will ever be a problem.

oh thought i already did that, i must have missed a spot

and as for the 100 range sanity check, if any mod does that the dev is just a tad insane

fixed in 2.0.6