error http server api error

[wlandgraf (Wagner Landgraf)]

This is usually a problem with the certificate. Some references:

I can not find the certificate I created from lets encrypt

That error message is usually a problem with Windows itself and the certificate. It looks like the certificate is not valid or not properly recognized by Windows.

Certificate and tmshttpconf.exe

That is an error that is usually caused by a misconfiguration in the certificate itself. Maybe the certificate misses some relevant information, or the certificate chain is not recognized. It's a very generic error message, unfortunately, that is usually solved by reissuing the certificate with slightly different data.

HTTPS and Webcore

This is an issue with your certificate and Windows. There might be several reasons for that. Have you installed your certificate as a user certificate (wrong) or computer certificate (correct)?