What Does Overextended Mean?

Overextended occurs under the risk to reward when the risk to reward becomes negative.

By this it means, a risk to reward of 1 / 4 meaning you risk $1 to make $4, but if the risk to reward becomes negative or 1 / 0 meaning you risk $1 to make $0, the software will tell you the stock is overextended and too high based on statistics.