1.9.4

[13:24:32] [Server thread/ERROR] [FML]: net.minecraftforge.fml.common.MissingModsException: Mod Photoptics (Photoptics) requires [StellarAPI@[0.4.3.1,0.4.4.0)]
[13:24:32] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraftforge.fml.common.MissingModsException: Mod Photoptics (Photoptics) requires [StellarAPI@[0.4.3.1,0.4.4.0)]
Missing Mods:
StellarAPI : [0.4.3.1,0.4.4.0)

    at net.minecraftforge.fml.common.Loader.sortModList(Loader.java:266) ~[Loader.class:?]
    at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:504) ~[Loader.class:?]
    at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:91) ~[FMLServerHandler.class:?]
    at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:321) ~[FMLCommonHandler.class:?]
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:118) ~[lb.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:429) [MinecraftServer.class:?]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_91]

Why are you still on 1.9.4? Just update. 1.10 is nearly identical with 1.9.4

wow, what a response, not all my mods are available for 1.10 yet? maybe thats why

Wow, so 1.9.4 versions of them on 1.10 would make a crash?

yes
it does

Sorry for that, I won't backport current state to 1.9.4 version.
You probably make use of Photoptics on 1.9.4 versions, with older Stellar APIs.

no worries