Error - cannot find fullchain.pem

[cd228]

I tried installing dperson/nginx and suddenly got this error (I've used it several times before and it suddenly stopped working:

`Generating a RSA private key

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writing new private key to '/etc/nginx/ssl/privkey.pem'

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3069854608:error:0D0D90AD:asn1 encoding routines:ASN1_TIME_adj:error getting time:crypto/asn1/a_time.c:330:

2071/06/10 20:38:56 [emerg] 7#7: cannot load certificate "/etc/nginx/ssl/fullchain.pem": BIO_new_file() failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/etc/nginx/ssl/fullchain.pem','r') error:2006D080:BIO routines:BIO_new_file:no such file)

nginx: [emerg] cannot load certificate "/etc/nginx/ssl/fullchain.pem": BIO_new_file() failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/etc/nginx/ssl/fullchain.pem','r') error:2006D080:BIO routines:BIO_new_file:no such file)

2071/06/27 15:25:20 [emerg] 8#8: cannot load certificate "/etc/nginx/ssl/fullchain.pem": BIO_new_file() failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/etc/nginx/ssl/fullchain.pem','r') error:2006D080:BIO routines:BIO_new_file:no such file)

nginx: [emerg] cannot load certificate "/etc/nginx/ssl/fullchain.pem": BIO_new_file() failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/etc/nginx/ssl/fullchain.pem','r') error:2006D080:BIO routines:BIO_new_file:no such file)`