HELP! I have no idea what's wrong here!?

O.K. I deleted my previous post... it was too vague... the error is in the last sentence... its a riddle, and without the final sentence, there would be NO ERROR... the final sentence is the key... if it is impossible to find the error, then how did 20% find one??? So the Error is in the final sentence. If it was impossible to find an error then 100% would not have been able to find it, not 80%. The trick is, people focus on the letters themselves, looking for the error (i.e. the three v's are actually a W and a V... or the I's are actually lower case L's) there are no errors in the letters, the error is in the final sentence, I hope this is a little more understandable...