GTA V version?
Latest FXServer build.
Up to date?
Yeeeeeees.
Windows version?
Windows Server 2012 Standard Version 6.2 (Build 9200)
Did you try to disable/uninstall your Anti-virus?
Doesn’t have an anti-virus.
Did you try to delete caches.xml and try again?
Deleted cache folder, yes.
System specifications
Intel Xeon E5-2697A v4 @ 2.60GHz
2.00GB Ram
256 GB SSD
CitizenFX.log file
https://pastebin.com/m2ZdciMQ
Tried installing latest Visual C++, .NET Framework and restarting the box.