ERROR - org.apache.mahout.cf.taste.common.NoSuchItemException - Possible Causes of NoSuchItemException

Exception Thrown By:Cause
ClassMethod
CityBlockSimilarity
if either item is known
to be non existent in the data. 
EuclideanDistanceSimilarity
if either item is known
to be non existent in the dataTaste
UncenteredCosineSimilarity
if any item is known
to be non existent in the dataTaste