BO 4.0 - Unable to read xlsx (excel 2007) source

Hi Experts,

We use BusinessObjects Data Services 4.0 SP2 Patch 4, version 14.0.2.409 on Windows 2008 Server.We ran the job to

load data from a new excel (xlsx) file into database table, but we received the error message 'Could not find worksheet ... in file ..'.

But it works when we use excel 1997-03 format file (xls).

Could you please guide me as to what has caused such an error and how to resolve this.

Any configuration is missing in DS server or DS client?

Thanks,

Vicky