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

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at org.openstack4j.connectors.httpclient.HttpResponseImpl.readEntity(
at org.openstack4j.core.transport.functions.ResponseToActionResponse.apply(
at org.openstack4j.core.transport.functions.ResponseToActionResponse.apply(
at org.openstack4j.connectors.httpclient.HttpResponseImpl.getEntity(
at org.openstack4j.openstack.internal.BaseOpenStackService$Invocation.execute(
at org.openstack4j.openstack.identity.v3.internal.RoleServiceImpl.checkProjectUserRole(

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