The JSON function cannot serialize tables / objects with a nested property called ‘NewGroup’ of type ‘Polymorphic’

[AVTS]

Team i am tried my level best to correct the issue with several correction but could not trigger the button due to folowing error.

“The JSON function cannot serialize tables / objects with a nested property called ‘NewGroup’ of type ‘Polymorphic’”.

Requirement is to send the mail with csv attachement.

Note  : Flow is tested which is working fine with other buttons. And formula is working fine in Datatable display

Following my formula.

Test1.Run(User().Email,JSON(With({TheTable: Filter(Dailyinventory, DateDiff(createdon, Today(),Days) =0)},

AddColumns(AddColumns(GroupBy(TheTable,"crf99_sno","crf99_materialdesc", "crf99_materialno", "NewGroup"),
"Created On", Last(NewGroup).createdon,

"Qty",Sum(NewGroup,crf99_qty),
"Sapstock",LookUp(sapstock,material=crf99_materialno && plant="8934",unrestrictedStock)),
"Diff", Sapstock - Qty

))

Tried to add the  JSON format but no luck

Please assist with your suggestion.

[AVTS]

Friends need your guidance to overcome this error.