The server experienced an internal error :: Error retrieving account "https://acme-v02.api.letsencrypt.org/acme/acct/308058790"
Please help me.
An "internal error" in a response is a problem on the Let's Encrypt side. Looks like they're working on it. Probably best to just try again sometime later.
Hi @hiepsv201 and welcome to the LE community forum 
Pay attention to:
https://letsencrypt.status.io/
Thank you for informing me, I am reinstalling the website on a new VPS, but when I install SSL, I get the same error as above.
And now I have successfully installed SSL for the website: https://chieuta.com/, I have been using Let's Encrypt SSL for 3 years.
But in the recent update, Let's Encrypt announced that it will not be used on computers with the operating system winXP, 7, or old macbook, I am sorry about that.
But that's okay, I'm still loyal, and accompanying me in the future.
I'm not sure I understand: you got the same error when installing SSL but you also managed to successfully install SSL? That sounds a little bit contradictionary to me, although it seems everything is alright now. Your server is using the certificate issued yesterday.