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

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java.lang.NullPointerException:
at org.openstack4j.connectors.httpclient.HttpResponseImpl.readEntity(HttpResponseImpl.java:127)
at org.openstack4j.core.transport.functions.ResponseToActionResponse.apply(ResponseToActionResponse.java:31)
at org.openstack4j.core.transport.functions.ResponseToActionResponse.apply(ResponseToActionResponse.java:22)
at org.openstack4j.connectors.httpclient.HttpResponseImpl.getEntity(HttpResponseImpl.java:65)
at org.openstack4j.openstack.internal.BaseOpenStackService$Invocation.execute(BaseOpenStackService.java:193)
at org.openstack4j.openstack.identity.v3.internal.RoleServiceImpl.checkProjectUserRole(RoleServiceImpl.java:53)

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