HTTP Status 500 - Servlet execution threw an exception

type Exception report

message Servlet execution threw an exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet execution threw an exception
root cause

java.lang.NoSuchMethodError: org.slf4j.spi.LocationAwareLogger.log(Lorg/slf4j/Marker;Ljava/lang/String;ILjava/lang/String;[Ljava/lang/Object;Ljava/lang/Throwable;)V
	org.apache.commons.logging.impl.SLF4JLocationAwareLog.trace(SLF4JLocationAwareLog.java:107)
	org.apache.commons.httpclient.methods.GetMethod.<init>(GetMethod.java:90)
	org.apache.solr.client.solrj.impl.CommonsHttpSolrServer.request(CommonsHttpSolrServer.java:292)
	org.apache.solr.client.solrj.impl.CommonsHttpSolrServer.request(CommonsHttpSolrServer.java:246)
	org.apache.solr.client.solrj.request.QueryRequest.process(QueryRequest.java:89)
	org.apache.solr.client.solrj.SolrServer.query(SolrServer.java:266)
	org.dspace.xoai.solr.DSpaceSolrSearch.query(DSpaceSolrSearch.java:34)
	org.dspace.xoai.data.DSpaceItemSolrRepository.getResult(DSpaceItemSolrRepository.java:129)
	org.dspace.xoai.data.DSpaceItemSolrRepository.getItems(DSpaceItemSolrRepository.java:119)
	org.dspace.xoai.data.DSpaceItemRepository.getItems(DSpaceItemRepository.java:114)
	com.lyncode.xoai.dataprovider.data.internal.ItemRepository.getItems(ItemRepository.java:272)
	com.lyncode.xoai.dataprovider.OAIDataProvider.build(OAIDataProvider.java:628)
	com.lyncode.xoai.dataprovider.OAIDataProvider.handle(OAIDataProvider.java:195)
	org.dspace.xoai.util.XOAICacheManager.handle(XOAICacheManager.java:219)
	org.dspace.xoai.DSpaceOAIDataProvider.doGet(DSpaceOAIDataProvider.java:139)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.40 logs.

Apache Tomcat/7.0.40