Hi to All, sometimes but not always a problem will be encountered(showed in bellow pic) when adding Graphic to GraphicOverlay.
Hi Yan,
Please look at the thread that has the same issue a yours:
https://community.esri.com/thread/186645-im-getting-a-new-error-calling-graphicsoverlaygraphicsaddgraphic-cannot-call-this-method-in-this-context-graphic-already-has-an-assigned-id
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