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Ok, I figured it out.
When you open opis and run it. After that you go to "Entities Amount". You search for the Entity that is listed in the error and click on it and use the Kill All button. That fixed it for me.
What OS are you running?
Windows 7 Ultimate
Are you using minecraft hosting provider or a dedicated/local server not designed for minecraft?
Dedicated server
What version of FTB are you using? (Dont just say latest tell us the version)
Direwolf20 Pack Version 1.0.21
Did you add any mods to...
