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

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java.lang.NullPointerException:
at org.openstack4j.openstack.identity.internal.DefaultEndpointURLResolver.resolveV3(DefaultEndpointURLResolver.java:110)
at org.openstack4j.openstack.identity.internal.DefaultEndpointURLResolver.findURL(DefaultEndpointURLResolver.java:50)
at org.openstack4j.openstack.internal.OSClientSession.getEndpoint(OSClientSession.java:202)
at org.openstack4j.core.transport.HttpRequest$RequestBuilder.build(HttpRequest.java:405)
at org.openstack4j.openstack.internal.BaseOpenStackService$Invocation.executeWithResponse(BaseOpenStackService.java:182)
at hello.test.FirstClass.main(FirstClass.java:16)

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