Server Crash - UnknownFunction

Server got compiled and run smoothly until a player tries to connect.
We can play in editor on Dedicated Server

Then i get this error.

I think if i fix this i can fix the above. I get this while using ProjectLauncher.

UnrealBuildTool: ERROR: UBT ERROR: Failed to produce item: Q:\Unreal Projects\Vitae\Binaries\Win64\UE4Editor-Vitae.pdb

I solved this a while back but never answered it, it was a corrupt variable that i needed to replace.