The method '' was called on null. Receiver: null Tried calling: (null)

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    class _BillDetailsWidgetState extends State {
  _BillDetailsWidgetState(
      {this.qtyCount,
      this.singleServicePrice,
      this


                      
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The method '*' was called on null. Receiver: null Tried calling: *(null)

The method '' was called on null. Receiver: null Tried calling: (null)