Not able to process a Cube

Hi All,

I am getting the following problem while processing the Cube.

Processing the cube gives me this warning message

The  thrown is AnalysisServicesProject1 database already exist on the localhost server, If you proceed with deployment the database will be overwritten.

When I click yes to overwrite , the following error is thrown and the cube fails to process:

Error 7 Parser: The syntax for the ImpersonationInfo object is incorrect. If the ImpersonateAccount value is used for ImpersonationInfo, then the Account property cannot be empty. 0 0

Vs Error says that Adventureworks DW 2008R2 cube was not found, when i checked the solution location the cube is present there.

Please help me with this as I am new to this, may be this is a basic Question.

Also: there were some errors in the machine so I have reinstalled the SQL server 2008R2 Dev edition again into the machine, previously too, it was having one Project for SSAS with the name AnalysisServicesProject1, however that was deleted before creating this project and the machine was restarted once.