PhotoShop Define Brush Preset [closed]

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I'm trying to make a brush that gives a sparkle effect. It's just a circle brush with a cross in the middle. Any way, when I try to define the brush preset, it says "Could not complete the command Define Brush Preset because the selected area is empty." Anyone know why this is happening?

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Press CTRL + D and deselect whatever you have selected. If you attempt to define a brush preset without anything selected, it should turn the whole image into a brush, but if you are trying to make a selection then make sure that you are selected on the correct layer.