Implemented mym launcher wont start

The game is running. Please wait.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
Error occurred during initialization of VM
Could not reserve enough space for object heap
Process ended with code: 1

This is the error message i get when i try to start it up, and thats with 3,750 max MB, but when i put it to 4,000 max MB it says this

The game is running. Please wait.
Error occurred during initialization of VM
The size of the object heap + perm gen exceeds the maximum representable size
Process ended with code: 1

I tryed 3,750 because my max i can set it to on the FTB launcher is 3.75 gigs.(If that info will help any)


edit: Also i put this on the monsters section because every time i try and join monsters with the FTB launcher and all mods it says to enable enabled, it just crashes my minecraft every time i join, and these errors are me trying to launch monsters on the MyM launcher