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From Sean Owen <sro...@gmail.com>
Subject Re: taste-web example booboo
Date Thu, 28 May 2009 11:00:44 GMT
The cause is that the DataModel has no items. (I will improve the
error checking to produce a better error.) So there is some problem in
loading up the DataModel. It seems to have succeeded but didn't load
anything? weird. If you can, provide the code that creates the
DataModel?

On Wed, May 27, 2009 at 10:54 PM, Jack Tanner <ihok@hotmail.com> wrote:
>
> I'm trying to run the taste-web example using mahout 0.1 and the grouplens dataset. All
the steps here went fine:
>
> http://lucene.apache.org/mahout/taste.html#demo
> But now I get:
>
> Problem accessing /mahout-taste-webapp/RecommenderServlet. Reason:
>    size must be at least 1
> Caused by:java.lang.IllegalArgumentException: size must be at least 1
>        at org.apache.mahout.cf.taste.impl.common.FastSet.(FastSet.java:68)
>        at org.apache.mahout.cf.taste.impl.recommender.slopeone.MemoryDiffStorage.(MemoryDiffStorage.java:110)

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