[MC-74933] Could Anyone Help Me? Please read description

So, i tried to allocate more memory for my minecraft. I usually have 4GB but i put it down for other reasons. This time, when i put the JVm argument to =
-Xmx4G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M, the message in the attached picture comes up on the out put screen? i really need some help.

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kumasasa 2014-11-30T16:32:54Z

This is a technical support issue; this site is for bug reports only. For technical support please use the Mojang Support Center.

kasamikona 2014-12-05T18:30:36Z

Put it as
-Xms128M -Xmx4G -XX:+UseConcMarkSweepGC -XX:-UseAdaptiveSizePolicy
and try again. I don't know why you try setting a minimum RAM value. There seems to be no good reason to do this. Using Xms (memory start) instead means that it reserves at least 128MB of ram the moment the game starts, and the game will likely use more than that when it can, but if it uses less than 128MB it will still keep 128MB reserved for itself. Also I removed the problematic part.