Excel expression not found , for example：=SUM(A1,A2)

[YuboChu]

XLS:
A1 : 1
A2 : 2
A3: =SUM(A1,A2)
code：
for colKey, col := range row.GetCols() {
formatIndex := xl.GetXFbyIndex(col.GetXFIndex())
colValue := col.GetString()
fmt.Println(colValue, formatIndex.GetFormatIndex(), col.GetType())
}
result：
1 0 *record.Rk
2 0 *record.Rk

A3 not found