[Expression evaluation error at function 'reject' [line 39]: Incorrect number of parameters for function; expected 1 parameters, but found 0 parameters.]

Shubham Aware 

My exact requirement are if there is no any data/value in "escalatedto" field then the filter can't show any null value in dropdown.

I want if there is a data in field then filter shows that value 

Hi experts

Anybody help me on above code . I am still facing issues .

Thanks 

In your code for local!groupMembers you intentionally create an entry with blank ID and blank Name when the current entry of local!escalatedTo is blank.  This is what's causing your dropdown to have a blank entry.  This is the expected behavior.

Hey jojog0003 ,
Try this code 

a!localVariables(
  local!group: index(
    rule!CDM2_findUserGroup(loggedInUser()),
    1,
    {}
  ),
  local!escalatedTo: if(
    a!isNullOrEmpty(local!group),
    {},
    index(
      a!queryEntity(
        entity: cons!CDM2_DSE_INQUIRIES,
        query: a!query(
          aggregation: a!queryAggregation(
            aggregationColumns: {
              a!queryAggregationColumn(field: "escalatedTo", isGrouping: true)
            }
          ),
          logicalExpression: a!queryLogicalExpression(
            operator: "AND",
            filters: {
              a!queryFilter(
                field: "groupId",
                operator: "=",
                value: local!group
              )
            },
            ignoreFiltersWithEmptyValues: false
          ),
          pagingInfo: a!pagingInfo(startIndex: 1, batchSize: - 1)
        ),
        fetchTotalCount: false
      ),
      "data",
      "escalatedTo",
      null()
    )
  ),
  local!tmodData: a!flatten(
    a!forEach(
      items: local!escalatedTo,
      expression: if(
        a!isNullOrEmpty(fv!item),
        {},
        if(
          not(isusernametaken(fv!item)),
          fv!item,
          {}
        )
      )
    )
  ),
  local!tmodGivenNames: if(
    a!isNotNullOrEmpty(local!tmodData),
    index(
      a!queryEntity(
        entity: cons!TMODS_DSE,
        query: a!query(
          selection: a!querySelection(
            columns: {
              a!queryColumn(field: "given_name"),
              a!queryColumn(field: "preferred_given_name"),
              a!queryColumn(field: "enterprise_login_id"),
              
            }
          ),
          logicalExpression: a!queryLogicalExpression(
            operator: "AND",
            filters: {
              a!queryFilter(
                field: "enterprise_login_id",
                operator: "IN",
                value: upper(local!tmodData)
              )
            },
            ignoreFiltersWithEmptyValues: true
          ),
          pagingInfo: a!pagingInfo(startIndex: 1, batchSize: - 1)
        ),
        fetchTotalCount: false
      ),
      "data",
      null()
    ),
    {}
  ),
  local!groupMembers: a!forEach(
    items: local!escalatedTo,
    expression: if(
      a!isNullOrEmpty(fv!item),
      {},
      if(
        not(isusernametaken(fv!item)),
        {
          xid: fv!item,
          name: a!localVariables(
            local!blankTmodGivenName: displayvalue(
              upper(fv!item),
              touniformstring(
                local!tmodGivenNames.enterprise_login_id
              ),
              if(
                /*a!isNullOrEmpty(local!tmodGivenNames.preferred_given_name),*/
                a!isNullOrEmpty(
                  index(
                    local!tmodGivenNames.preferred_given_name,
                    wherecontains(
                      upper(fv!item),
                      touniformstring(
                        local!tmodGivenNames.enterprise_login_id
                      )
                    ),
                    {}
                  )
                ),
                local!tmodGivenNames.given_name,
                local!tmodGivenNames.preferred_given_name
              ),
              {}
            ),
            if(
              a!isNullOrEmpty(local!blankTmodGivenName),
              fv!item,
              local!blankTmodGivenName
            )
          )
        },
        {
          xid: fv!item,
          name: user(fv!item, "firstName") & " " & user(fv!item, "lastName")
        }
      )
    )
  ),
  a!recordFilterList(
    name: "Escalated To",
    isVisible: and(
      a!isNotNullOrEmpty(local!groupMembers),
      a!isNotNullOrEmpty(local!escalatedTo)
    ),
    options: a!forEach(
      items: local!groupMembers,
      expression: a!recordFilterListOption(
        id: fv!index,
        name: fv!item.name,
        filter: a!queryFilter(
          field: 'recordType!{92bc5c32-2509-4558-b252-56df608deb1a}.fields.{escalatedTo}',
          operator: "=",
          value: fv!item.xid
        )
      )
    )
  )
)

Shubham Aware 

The above code not working . I am still getting the error 

Expression evaluation error at function a!forEach [line 140]: Error in a!forEach() expression during iteration 1: Expression evaluation error at function a!queryFilter [line 145]: Invalid index: Cannot index property 'xid' of type String into type List of Variant.

Thanks 

I modified my above posted code. Check that once.
Also Can you share the value coming for local!groupMembers.