问题 使用StartSSL证书在Mac OSX上的Node.js上启动HTTPS时出错

我试图使用StartSSL证书运行HTTPS服务器。我从他们那里得到了所有必要的文件，并通过传递它们来使用它们 createServer 参数：

var options =
{
    ca:     FS.readFileSync('sub.class1.server.ca.pem'),
    key:    FS.readFileSync('ssl.key'),
    cert:   FS.readFileSync('ssl.crt')
};

这就是我得到的错误。

Error: error:0906D06C:PEM routines:PEM_read_bio:no start line
    at Object.createCredentials (crypto.js:87:31)
    at HTTPSServer.Server (tls.js:914:28)
    at HTTPSServer.Server (https.js:33:14)
    at HTTPSServer.HTTPSServer (/Users/myUserName/node_modules/connect/lib/https.js:34:16)
    at new HTTPSServer (/Users/myUserName/node_modules/express/lib/https.js:38:23)
    at Object.createServer (/Users/myUserName/node_modules/express/lib/express.js:43:12)
    at Object.<anonymous> (/Users/myUserName/Sites/node.js/https/app.js:12:36)
    at Module._compile (module.js:441:26)
    at Object..js (module.js:459:10)
    at Module.load (module.js:348:31)

我想也许我应该将证书转换为PEM。但是跑步：

openssl x509 -in ssl.crt -out ssl.der -outform DER

......给了我类似的错误

unable to load certificate
67304:error:0906D06C:PEM routines:PEM_read_bio:no start line:/SourceCache/OpenSSL098/OpenSSL098-44/src/crypto/pem/pem_lib.c:648:Expecting: TRUSTED CERTIFICATE

知道为什么吗？

更新： 这只发生在OSX上。我尝试在Ubuntu服务器上运行相同的东西，它的工作原理。