Error using DBPEDIA

[cnarvaa]

Hi, I'm getting this error when trying to reconcile a column on a single csv datasheet.

<title>Error 500 Class org.apache.http.impl.client.SystemDefaultHttpClient does not implement the requested interface org.apache.http.client.HttpClient</title>

HTTP ERROR 500

Problem accessing /extension/rdf-extension/services/dbpedia2. Reason:

    Class org.apache.http.impl.client.SystemDefaultHttpClient does not implement the requested interface org.apache.http.client.HttpClient

Caused by:

java.lang.IncompatibleClassChangeError: Class org.apache.http.impl.client.SystemDefaultHttpClient does not implement the requested interface org.apache.http.client.HttpClient
Do you know how to solve it?, I tried with open refine 2.8 and 2.6 and i get the same error.