How to create dynamics ax 2012 report using OLAP datasource

I'm already create Analysis Service outside dynamics ax.

Need to create a report using OLAP data source in vs.2010. i got this error when i'm create dataset with AX OLAP and paste MDX Query inside.

"THE MDX QUERY FOR THE OLAP DATA SOURCE IS NOT VALID.  THE FOLLOWIG ERROR OCCURED...... USER XXX DOES NOT HAVE ACCESS TO THE DYNAMICS AX DATABASE OR THE DATABASE IS NOW EXIST"

My cube already registered in analysis server dynamics AX.

Anybody can help me how to create dynamics ax 2012 report using olap data source?