Using ALSM_EXCEL_TO_INTERNAL_TABLE

Dear experts,

As my scenario, I have a web dynpro, and what I must do is import an Excel file from client to SAP back-end. I created a BAPI using the function module ALSM_EXCEL_TO_INTERNAL_TABLE to import Excel data to internal table and then processing in SAP. But unfortunately, when I run the web, it throws an error: Error during import of clipboard contents, error key: RFC_ERROR_SYSTEM_FAILURE. Have you guys ever met this problem? Please show me the the solution, or guide me how to fix this error.

Thanks in advance.