java.lang.Exception: java.lang.NullPointerException

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java.lang.Exception: java.lang.NullPointerException
at org.apache.solr.client.solrj.impl.HttpSolrServer.(HttpSolrServer.java:136)
at org.dspace.authority.AuthoritySolrServiceImpl.getSolr(AuthoritySolrServiceImpl.java:49)
at org.dspace.authority.AuthoritySolrServiceImpl.cleanIndex(AuthoritySolrServiceImpl.java:72)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:225)

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