[BigDig server won't start]

When i start launch.bat it says 

E:\Minecraft\SERVER\BigDig>java -Xmx3G -Xms2G -jar BigDig.jar nogui
Error occurred during initialization of VM
Could not reserve enough space for 3145728KB object heap

E:\Minecraft\SERVER\BigDig>pause
Press any key to continue . . .

 

and when i try to open BigDig.jar it won't open and it gives me just some files.

[[3.1.2] Xeon Gaming Tekkit 3 Server, [PvE/PVP], [60 SLOT], [GREYLISTED], [ONLY ANCHORS REMOVED]]

IGN: Marko Galiman

Reason for wanting to become a member: Im looking for a friendly dependable tekkit server

Why should we accept you: I'm friendly, love playing minecraft and i love to play with other people :)