Could Not Create Java Machine

It said "Could Not Create Java Machine" and kept crashing.

What I expected to happen was...:
I was already logged into my Minecraft Launcher. When I pressed play, it should have started Minecraft.

What actually happened was...:
Instead, when I pressed Play it said "Could Not Create Java Machine." Then, I kept pressing play after getting rid of the error box each time. It then changed to "There is not enough memory" etc. Then it finally crashed.

Steps to Reproduce:
1. Start Minecraft Launcher.
2. Log in. (Mine automatically logs me in.)
3. Press Play.