According to the log, Holograms loaded fine, just World edit which had an issue:
[19:52:54] [Server thread/INFO] [FML]: FML has found a non-mod file worldedit-bukkit-6.1.9-SNAPSHOT-dist.jar in your mods directory. It will now be injected into your classpath. This could severe stability issues, it should be removed if possible.
It looks like you’re using the Spigot/ Bukkit version. I personally use the Mod version of World Edit, never had a problem with it.