Server Error-Message

[Refex]

I get this error message in my server console if i try to start a server:

Missing Class Class Editor.TransBuffer
an't find 'intASteamStatsAndAchievementsBaseexecDoPotato' in 'Engine.dll'
Executing UObject::StaticShutdownAfterError
Can't find 'intASteamStatsAndAchievementsBaseexecDoPotato' in 'Engine.dll'



History:

Exiting due to error
Exiting.
FileManager: Reading 0 GByte 11 MByte 616 KByte 243 Bytes from HD took 0.046555 seconds (0.008773 reading, 0.037782 seeking).
FileManager: 0.000000 seconds spent with misc. duties
Name subsystem shut down

Seems like the engine.dll makes the error. Where can i get one for my server?