Command, Could not reserve enough space for 2097152 kb Object heap?

So I am trying to create a sky factory server for my minecraft, Whenever i run the launch server file the command box shows up and says this:OS is 64
Java HotSpot(TM) Client VM warning: ignoring option MaxPermSize=256M; support was removed in 8.0
Error occurred during initialization of VM
Could not reserve enough space for 2097152KB object heap
Press any key to continue…
When i press any key the command box closes how can i fix this?

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