how to draw circle?

[thanagonbunmee]

I try to  draw Circle but it error

this is my code : https://github.com/thanagon7214/mapDrawCiracle.git

this is  cdn

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<link rel="stylesheet" href="https://js.arcgis.com/4.23/esri/css/main.css">

<script defer src="https://js.arcgis.com/4.6/"></script>

eror line 118  

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action.on("vertex-add", drawCircle);