It seems the analysis services cube doesn't process well. Log on to the application-tier server and open the Warehouse Control Web Service by entering the following URL in a supported web browser:
http://localhost:8080/tfs/TeamFoundation/Administration/v3.0/WarehouseControlService.asmx
And follow the article below to manually process data warehouse and analysis services cube for Team Foundation Server:
http://msdn.microsoft.com/en-us/library/ff400237.aspx
If manually processing doesn't work, you can try to delete the Tfs_Analysis database and recreate it using TFS Admin Console. To delete the Tfs_Analysis database, you can connect to Analysis Service using Microsoft SQL Server Management Studio, expand the Databases node, and delete the Tfs_Analysis database.
To recreate the Tfs_Analysis database, please refer to the following steps:
Launch TFS Admin Console>>Application Tier>>Reporting, in the right panel, click Edit to open the Reporting windows.
Under the Analysis Services tab, input the Tfs_Analysis under Database textbox, and re-provide the required account under Account for accessing data source.
Click Ok to generate the Tfs_Analysis database in Analysis Services.
Click Start Jobs and Start Rebuild to rebuild warehouse and the Analysis Services database.