Unable to allocate XXX MB of RAM error in Hyper-V

So… after trying Windows 10, I ran into first annoying issue which seem to have no solution at this point.

Main reason I wanted to upgrade to Win 10 (not sure if I had choice since MSFT is literally forcing everyone to upgrade to Win 10) was to try Hyper-V. I am running at any given time @ 3 VMs together and my laptop has 8GB of ram so it has no issue running all of them together.

But today I was getting odd error when I tried to start VMs for something. Exact error was like below,

HyperV

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