Javascript causing an error tring to get the row and cell index when a GridView is clicked

// Javascript - get cell and row index
function cellClicked(row, column)
{
         document.getElementById('<% = hfAction.ClientID %>').value = "CellClick";
         document.getElementById('<% = hfRow.ClientID %>').value = row;
         document.getElementById('<% = hfColumn.ClientID %>').value = column;
         form1.submit();
}

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    Private Sub GridView1_RowDataBound(sender As Object, e As GridViewRowEventArgs) Handles GridView1.RowDataBound


        If e.Row.RowType = DataControlRowType.DataRow Then
            '//Following code used to change row color on mouseover
            'e.Row.Attributes.Add("onmouseover", "this.originalcolor=this.style.backgroundColor;" & " this.style.backgroundColor='#ccdfdf';")
            'e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=this.originalcolor;")
            For columnIndex As Integer = 1 To e.Row.Cells.Count - 1
                '//https://forums.asp.net/t/1639326.aspx?Gridview+Cell+Click+Event+Get+Row+Column+Index
                e.Row.Cells(columnIndex).Attributes.Add("onclick", String.Format("cellClicked({0},{1});", e.Row.RowIndex, columnIndex))
                e.Row.Cells(columnIndex).Attributes.Add("onclick", "alert(""CellClicked"");")
            Next

        End If

    End Sub

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Server Error in '/' Application.
Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.ArgumentException: Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 


[ArgumentException: Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.]
   System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument) +9818922
   System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument) +108
   System.Web.UI.WebControls.GridView.RaisePostBackEvent(String eventArgument) +32
   System.Web.UI.WebControls.GridView.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +15
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +15
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +9884270
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1639

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3282.0

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