This error comes when TDS details (24q,26q,27q,27eq) are imported from Excel Template and the tax rate is not entered in the numeric format
Open excel template > "deductee detail" sheet
Select a cell or a cell range (Rate at which tax deducted (423) )
On the Home tab, select Number from the drop-down.
Right-click the cell or cell range, select Format Cells… , and select Number.
Hope This Helps