What does "interpolate no end color found" mean ?"

[ggaliens]

What does "interpolate no end color found" mean ?"

It could mean I can't read again. Not sure.

(palette action).

[micheus]

I think you are trying to create a gradient color pattern. If so, you need to set the first color and the last one.
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[edited]
From that other thread
We set each color key and use Interpolate between them to create the gradient:

Calling Interpolate after the last color key (red) will result in that message you has pointed.

[ggaliens]

I think one needs be positioned in-between on an empty cell ?

I think I was clicking on first color or end color and getting confused.

I'm all good with this now. Thanks.

[micheus]

I think one needs be positioned in-between on an empty cell ?

yeah. The information line shows "Interpolate empty colors" when the item selected in the context menu is "Interpolate" and this option just appears in the context menu if you activate it in a empty color slot.
It's ok, the info for menu items change so fast that sometimes we just don't remember to check it. I already did that.

I'm all good with this now.

Nice.

[ggaliens]

Was wanting to interpolate my way to an "artists" color wheel sort of arrangement ... to the extend that it could be laid out in that grid.

Turns out ... I'd be better off using HSV or maybe just HUE values 0 - 360 degrees ... and then compute the RGB Values ... maybe just the ones on outside of color wheel. Brightest I guess.

Didn't do it yet. Does it do that already ... make the rainbow ROYGBIV with a few clicks ?

[micheus]

Does it do that already ... make the rainbow ROYGBIV with a few clicks ?

In a few clicks... I don't think so.

Maybe you would try something like in Kerkythea:

It would be nice have one like this.