Your search condition exceeds the maximum length for a varchar which is 4,000. You are trying to pass it over 6,000 characters.
Check out BOL for CONTAINS, http://msdn.microsoft.com/en-us/library/ms187787.aspx
A quote from that page about the search condition.
<contains_search_condition> is nvarchar. An implicit conversion occurs when another character data type is used as input.
You may have to break this into a couple of queries in order to use a search condition that long.
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