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Apparently, you have another Grid by that name. Expand the Error Dialog Box and see what the Element ID is so you can locate it. Maybe it's hidden in View BY Element or BY Filter. Press the lightbulb icon on the VCB to Reveal Hidden Elements.
Create a grid schedule, select the rows with the name 1,2,4,4 and delete them. Then you can add grids using these name again.
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