"sortField" is getting error when the data came from Stored Procedure. Can you please any suggestion how to sort the column when we use stored proc?

Question

a!gridColumn(
          label: "Conformance",
          sortField: "adherence",          
          value: a!richTextDisplayField(
            label: "Adherence",
            value: {
              a!richTextItem(
                text: if(
                  rule!INO_isBlank(fv!row.adherence),
                  "-",
                  fixed(fv!row.adherence, 2) & "%"/*text(fv!row.adherence /100, "##.##%")*/
                  
                ),
                link: a!dynamicLink(
                  value: fv!row.employee,
                  saveInto: {
                    ri!selectedEmployee,
                    a!save(ri!selectedEmployeeRow, fv!identifier)
                  },
                  showWhen: and(
                    and(
                      not(isnull(ri!showDynamicLinks)),
                      ri!showDynamicLinks
                    ),
                    fv!row.adherence <> 0,
                    not(or(fv!row.employee.isTeamLead))
                  )
                ),
                linkStyle: "STANDALONE",
                color: "STANDARD",
                size: "MEDIUM",
                style: if(
                  and(fv!row.employee = ri!selectedEmployee),
                  "STRONG",
                  "PLAIN"
                )
              ),
              " ",
              a!richTextIcon(
                icon: if(
                  isnull(fv!row.adherence),
                  null,
                  if(
                    todecimal(fv!row.adherence) >= todecimal(local!adhereranceTarget.targetValue),
                    "check-circle",
                    "minus-circle"
                  )
                ),
                caption: "Target Minimum: 95%",
                showWhen: and(fv!row.adherence <> 0),
                color: if(
                  isnull(fv!row.adherence),
                  null,
                  if(
                    todecimal(fv!row.adherence) >= todecimal(local!adhereranceTarget.targetValue),
                    cons!INO_HEX_POSITIVE,
                    cons!INO_HEX_NEGATIVE
                  )
                ),
                size: "MEDIUM"
              )
            }
          )
        ),

This error is showing after clicking "Conformence" column. Because this data came from stored procedure and that's why "sortField" not working proper and we are getting this error. How to sort then?