BPC NW 7.5 - Request failed with HTTP status 400: Bad Request

Dear Experts,

I am trying to upload a flat file to BPC server. I am getting the following error.

" Request to transfer a file to the server failed (ERROR): The request failed with HTTP status 400: Bad Request"

Could any of you please help?

I am selecting BPC for excel >manage data > upload data file > selection for source file > selection of destination file > ok

Thanks in advance

Vipin Jain