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We can’t log you in because of an authentication error.

when I was installing an app from appexchange, I got the oauth error. My account is the type of 30-day-free. 

Error code : 1800。

who can help me?
NagendraNagendra (Salesforce Developers) 
Hi,

I also faced the same issue in past may I suggest you clear your chrome browser cache and cookies once and try again. now you can log in successfully in appExcahnge and install the app.

Hope this helps.

Please mark this as solved if it's resolved.

Regards,
Nagendra.

 
wc wcwc wc
I tried as you say, but didn't work. The account I registered last year is ok. Only this year, all the new accounts can not sign in any connected apps, and I get the error message: 

We can't authorize you because of an OAuth error.
For more information, contact your Salesforce administrator.
1800 : There was a problem in setting up your remote access