knowledgebase issue

i installed knowledge ening in linus and it worked fine the engine is connected when i verify server,

but when i trh to full reindex knowledgebase i get the below error in log 

 

java.lang.NullPointerException
at com.hp.ov.sm.server.plugins.knowledgemanagement.solr.KMSolrSearch.getIndexStatistics(KMSolrSearch.java:967)
at com.hp.ov.sm.server.utility.GenericServerThread.symanContinue(Native Method)
at com.hp.ov.sm.server.utility.GenericServerThread.run(GenericServerThread.java:58)
19796( 20048) 06/07/2016 14:21:39 JS I Index statistics not clear.
19796( 20048) 06/07/2016 14:21:39 Core: Knowledge_Library is down or does not exist
19796( 20048) 06/07/2016 14:21:39 [Ljava.lang.StackTraceElement;@1bbb1c3