SSL:错误:02001002:系统库:fopen:没有这样的文件或目录

我有Ubantu 16.04

/etc/nginx/sites-enabled#这个目录default文件包含如下代码:

 # HTTPS server server { listen 443 ssl; # we enable SPDY here server_name www.bitradiology.com; # this domain must match Common Name (CN) in the SSL certificate root html; # irrelevant index index.html; # irrelevant ssl_certificate /root/bitradiology.chained.crt; # full path to SSL certificate and CA certificate concatenated together ssl_certificate_key /root/bitradiology.key; # full path to SSL key # performance enhancement for SSL ssl_stapling on; ssl_session_cache shared:SSL:10m; ssl_session_timeout 5m; # safety enhancement to SSL: make sure we actually use a safe cipher ssl_prefer_server_ciphers on; ssl_protocols TLSv1 TLSv1.1 TLSv1.2; .............some other code........ 

当我运行命令sudo nginx -t它提供以下错误:

 nginx: [emerg] BIO_new_file("/root/bitradiology.chained.crt") failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/root/bitradiology.chained.crt','r') error:2006D080:BIO routines:BIO_new_file:no such file) nginx: configuration file /etc/nginx/nginx.conf test failed 

如何解决这个问题?