I had the same problem. Support for the Radeon HD 6900 has been dropped in recent drivers.
"...Radeon™ HD 6000 Series, and Radeon™ HD 5000 Series Graphics products have been moved to a legacy support model and no additional driver releases are planned. "
Go here: Download Drivers and select "Desktop Graphics", then "HD Radeon Series", etc. to select the appropriate driver.
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Could you plz provide us with your clinfo output?
Also plz describe your system and your graphics driver.