Sounds like the game code changed with an update. Not much you can do except fix the mod code yourself, there's a link in the mod description.

Factory buffer failed to load!

An error occured while processing factorybuffer/factorybuffer.dll

Exception has been thrown by the target of an invocation.

Patching exception in method null

Undefined target method for patch method static
System.Boolean
FactoryBuffer.DeviceUiPatch::Prefix(System.Boolean
immediate, VoxelTycoon.Buildings.Device___device,
System.Collections.Generic.List ` 1<VoxelTycoon.
Item, VoxelTycoon.UI.Progress.ResourceView>
___itemToProgressResourcesView)