java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.neo4j.ogm.session.delegates.LoadOneDelegate.lookup(LoadOneDelegate.java:56)
at org.neo4j.ogm.session.delegates.LoadOneDelegate.load(LoadOneDelegate.java:49)
at org.neo4j.ogm.session.delegates.LoadOneDelegate.load(LoadOneDelegate.java:39)
at org.neo4j.ogm.session.Neo4jSession.load(Neo4jSession.java:137)
at org.neo4j.ogm.session.Capability$LoadOne$load.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:110)
at undefined.Main.main(Main.groovy:24)

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