Can anyone explain how to fix this error: Invalid index: Cannot index property 'Status' of type Text into type Text.

Hi, 

I am having some issues with a!save. When I use the below code and select a data point on the chart the following error occurs:

Could not display interface. Please check definition and inputs. Interface Definition: Expression evaluation error: An error occurred while executing a save: java.lang.IllegalArgumentException: Invalid index: Cannot index property 'Status' of type Text into type Text.

{
  with(
    local!chartPagingInfo: a!pagingInfo(
      startIndex: 1,
      batchSize: - 1,
      sort: a!sortInfo(
        field: "SubmittedDate",
        ascending: true
      )
    ),
    local!SubmittedDate: null,
    local!datasubset: a!queryEntity(
      entity: cons!NSARequest_Entity_Cons,
      query: a!query(
        aggregation: a!queryAggregation(
          aggregationColumns: {
            a!queryAggregationColumn(
              field: "Status",
              alias: "Status",
              isGrouping: true
            ),
            a!queryAggregationColumn(
              field: "SubmittedDate",
              alias: "SubmittedDate",
              isGrouping: true,
              groupingFunction: "MONTH"
            ),
            a!queryAggregationColumn(
              field: "Id",
              aggregationFunction: "COUNT"
            )
          }
        ),
        pagingInfo: local!chartPagingInfo
      )
    ),
    local!Categories: index(
      local!datasubset.data,
      "SubmittedDate",
      {}
    ),
    local!uniqueCategories: union(
      local!Categories,cast(typeof(local!Categories),{})
    ),
    local!labels: index(
      local!datasubset.data,
      "Status",
      {}
    ),
    local!uniqueLabels: union(
      local!labels,
      cast(
        typeof(
          local!labels
        ),
        {}
      )
    ),
    local!series: a!forEach(
      local!uniquelabels,
      with(
       local!label: fv!item,
        a!chartSeries(
          label: local!label,
          data: a!forEach(
            local!uniqueCategories,
            with(local!intersection: intersection(
                where(local!Categories = cast(typeof(local!Categories), fv!item),0),
                where(local!labels = cast(typeof(local!labels),local!label), 0)
              ),
              if(condition: length( local!intersection) = 0,
                valueIfTrue: 0,
                valueIfFalse: index(index(local!datasubset.data,"Id",{}),local!intersection,0)
              )
            )
          ),
          links: a!dynamicLink( saveInto: { a!save(ri!selectedStatus, fv!item.Status)}
          )
        )
      )
    ),
    a!lineChartField(
      label: "Number of Assets per Month",
      categories: {
        {
          local!uniqueCategories
        }
      },
      series: local!series,
      xAxisTitle: "Month",
      yAxisTitle: "Number of Assets",
      showDataLabels: true
    )
  ),

Can anyone help?

Thanks