Resource entities from Geothermal (https://mods.factorio.com/mod/Geothermal) are unknown. I've got reports for geothermal-purple and geothermal-blue, others will probably also be affected. :-)
Oh, wait, that mod I had to disable was another one! Geothermal had a different issue: The author made a new mod, Dragon Industries - Nauvis Division. The description says "This is the core to all my Factorio mods, and is required for any of them to function", so I guess adding it should fix your problem.
Nope, i had that already installed, Geothermal spits out some sprite box error, its been reported on the authors github so im guessing he will fix it shortly