使用jclouds为amazon ec2创建EBS卷给出错误

Question

我使用以下代码在亚马逊ec2中创建EBS卷。相同的代码正在生产中并且工作正常。但是从最近几天开始，我得到了一个新例外。我找不到某个错误。请帮助理解错误。

else if (cloudType.toUpperCase().equalsIgnoreCase("AWS-EC2")) {
                EC2Api ec2Api = computeServiceContext.unwrapApi(EC2Api.class);
                LOG.info("initialized ec2 api for volume creation");

                org.jclouds.ec2.domain.Volume volume = ec2Api
                        .getElasticBlockStoreApi()
                        .get()
                        .createVolumeInAvailabilityZone(zoneId, size);

                ec2Api.getTagApi().get().applyToResources(ImmutableMap.of("Name",volumeName), ImmutableSet.of(volume.getId()));

                responseTemplate.setJobId(volume.getId());
                responseTemplate.setCreationTime(volume.getCreateTime());
                responseTemplate.setZoneId(volume.getAvailabilityZone());
            }

例外：

java.lang.IllegalArgumentException: argument at index 0 on invocation.getInvoked() public abstract org.jclouds.ec2.domain.Volume org.jclouds.ec2.features.ElasticBlockStoreApi.createVolumeInAvailabilityZone(java.lang.String,int) was null