SSL is failing the certificate

[mohamedahmed01]

logs showing :
sslproxy_1 | [emerg] 1#1: PEM_read_bio_X509_AUX("/etc/nginx/ssl/nginx.crt") failed (SSL: error:0906D06C:PEM routines:PEM_read_bio:no start line:Expecting: TRUSTED CERTIFICATE)

yet i've created the certificate and the key and add it to the certs folder
using
openssl req -x509 -sha256 -nodes -newkey rsa:2048 -days 365 -keyout localhost.key -out localhost.crt