Challenge failed for domain

[charles-leal]

I installed stingle correctly, but in the end, as I didn't know I needed to create a subdomain, I didn't create it and it gave the following error:
Performing the following challenges:
http-01 challenge for stingle.xxxxx.xxx.xx
Waiting for verification...
Challenge failed for domain stingle.xxxxx.xxx.xx
http-01 challenge for stingle.xxxxx.xxx.xx
Cleaning up challenges
Some challenges have failed.
Now after creating the subdomain, I would like to know how to correct this error?
Thank you very much!