Shared report doesn't work

Hi, guys..

I copied a report from the original workspace to another. I gave access to the new workspace to users, and also gave "build'' permission to the original dataset (main workspace).

After that the users can't see the context of the report as all data are presented with "X". Did the same procedure with other reports and worked fine. Any guess what could be wrong?? 

Any help would be appreciated.. 

Thanx!!