MC 1.10.2
Forge 12.18.1.2095
Botania r1.9-327

Works fine on client!
I receive the following error when loading on my server:

Missing Mods:
Forge : [12.18.1.2053,]

net.minecraftforge.fml.common.MissingModsException: Mod Botania (Botania) requires [Forge@[12.18.1.2053,]]
at net.minecraftforge.fml.common.Loader.sortModList(Loader.java:274)
at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:525)
at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:97)
at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:328)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:121)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:431)
at java.lang.Thread.run(Thread.java:745)

is the Forge version on the server older?

It is the one I listed Forge 12.18.1.2095! Works fine on client and server version Forge 12.18.1.2088!

Reverted back to 12.18.1.2088 for now!