failed with unknown result

Hi,
 
When I run the exemple from the BOL:

USE AdventureWorks;

GO

SELECT Description

FROM Production.ProductDescription

WHERE CONTAINS(Description, 'ISABOUT (performance weight (.8),

comfortable weight (.4), smooth weight (.2) )' );

GO

I receive the error message

Msg 7607, Level 17, State 1, Line 1

Search on full-text catalog 'AdvWksDocFTCat' for database ID 6, table or indexed view ID 1781581385 with search condition 'ISABOUT (performance weight (.8),

comfortable weight (.4), smooth weight (.2) )' failed with unknown result (0x80020005).

Does someone know why this error is throw?
 
Laurent
 
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