It may happen because of actually n/w went down or deadlock in query execution or connection time exhausted ..
Case 1: If you are facing this issue before report is been developed then try to use data source filter to limit the data flow and finish the development.
Case 2: If you are done with the dashboard development then create a empty extract and publish it on server and run the refresh so that data gets loaded.
For more details you can can run performance recording as well.
Thank you for your feedback unfortunately its doesn't work out.
Its happened before report has been developed I also tired to put limit but its doesn't work.
Thank you for your effort.
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I solved this issue. This happened because there is no primary key one of the table which i used in join.