This error lets you know that the version of Photoshop the designer has is more advanced than yours (Photoshop Extended and/or a more recent version). For this matter, some features included in the designer’s version are not recognized by yours. This can be exemplified by 3D layers or Smart Filters. This can be solved in no time if you contact your designer and discuss this error. Alternately, updating to CS5.1 or CS5.1 Extended will also ensure this error won’t show up anymore.
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