data greater than block(0) ???

Hello!

Does any one know what this SQLException means:

java.sql.SQLException: [TDS Driver]Error in the TDS datastream: data greater than block(0)
  at com.inet.tds.TdsConnection.if(Unknown Source)
  at com.inet.tds.TdsConnection.a(Unknown Source)
  at com.inet.tds.TdsStatement.a(Unknown Source)
  at com.inet.tds.TdsStatement.if(Unknown Source)
  at com.inet.tds.TdsStatement.executeQuery(Unknown Source)

I try to read a post from a databse and when I look at it I do not think that is is bigger than an other post that works fine. I do not know if the SQLException means that the post is to big

If some one can help me out with this I would be very greatful.
Best regards
Fredrik