OLE DB error: OLE DB or ODBC error: Login failed for user '\SQLSERVICE'.; 28000.

Hi,

I'm trying to process the dimensions and cubes and i'm getting the following error:

OLE DB error: OLE DB or ODBC error: Login failed for user '\SQLSERVICE'.; 28000.

I clicked on the data source and tested the connection and it was a success.

From my pc i remoted onto the dev server and created the cubes and dimensions , i'm using sql server 2008r2.When creating the cubes i used the default SERVICE ACCOUNT.Please let me know where i'm going wrong.

Thanks