Unable to start sole-exporter on branch_7x

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Unable to start sole-exporter on branch_7x

Karl Stoney
Hi,
I’m getting the following error when trying to start `solr-exporter` on branch `7_x`.

INFO  - 2019-04-10 23:36:10.872; org.apache.solr.core.SolrResourceLoader; solr home defaulted to 'solr/' (could not find system property or JNDI)
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/lucene/util/IOUtils
        at org.apache.solr.core.SolrResourceLoader.close(SolrResourceLoader.java:881)
        at org.apache.solr.prometheus.exporter.SolrExporter.loadMetricsConfiguration(SolrExporter.java:221)
        at org.apache.solr.prometheus.exporter.SolrExporter.main(SolrExporter.java:205)
Caused by: java.lang.ClassNotFoundException: org.apache.lucene.util.IOUtils
        at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 3 more

Any ideas?
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