Sequence Contains No Elements

Hi Experts,

I am new to SAP BPC and is in the process of self learning.

I have created dimensions and a new model. Now I want to fill some master data from flat file to one of the dimensions. For this purpose I am opening the excel add-in and then trying to connect to my newly created model. But it is giving error "Sequence contains no elements". However I am able to connect to the standard models already existing in the system. Please help.

Regards,

Arun.