Invalid postback or callback argument. Event validation is enabled using ”

by

Do you have code in your Page_Load events? if yes, then perhaps adding the following will help.

if (!Page.IsPostBack)
{ //do something }

This error is thrown when you click on your command and the Page_load is being ran again, in a normal life cycle it would be
Page_Load -> Click on Command -> Page_Load (again) -> Process ItemCommand Event

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