photoshop 7.0 "Content of this layer is not directly editable"

From: rc_latha@hotmail.com

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I am working on photshop 7.0 I tried some of your beginners tutorials. All I did was use rect tool to make a rectangle and tried to use the paint bucket tool to fill it with a color. A pop up message says. "contents of this layer is not directly editable" What can I do. Please help Note: I drew the rectangle in a separate layer and not in the background layer. thanks in advance for your help.