Hi,
Couple of points -
1) Pass some value for separator -
CALL FUNCTION 'TEXT_CONVERT_XLS_TO_SAP'
EXPORTING
I_FIELD_SEPERATOR =
2) Correct the F4 Help, its dumping.
Sample tutorial is here - http://www.****************/Tips/ABAP/UploadExcel/Prg.htm
Also post debug screenshots or rectify and give a working code so that i can debug.
BR.