Let's Encrypt 奇怪的不能续期，为什么啊？

Traceback (most recent call last):
  File "../acme_tiny.py", line 198, in <module>
    main(sys.argv[1:])
  File "../acme_tiny.py", line 194, in main
    signed_crt = get_crt(args.account_key, args.csr, args.acme_dir, log=LOGGER, CA=args.ca)
  File "../acme_tiny.py", line 161, in get_crt
    raise ValueError("Error signing certificate: {0} {1}".format(code, result))
ValueError: Error signing certificate: 429 {
  "type": "urn:acme:error:rateLimited",
  "detail": "Error creating new cert :: Too many certificates already issued for exact set of domains: api.aimoge.com",
  "status": 429
}

一直这个错误，马上要过期了，这该怎么办呢？