我应该检查什么来解决这个问题？
development中的一切正常，但我的代码是正确的
我的网站提供商（production）给了我这个错误：
RuntimeException: Failed to start the session because headers
have already been sent. in .../vendor/symfony/http
foundation/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php
line 142
更新1
一旦注册了SessionServiceProvider，我们是否必须手动调用
app["session"]->start()
这是error.log文件的摘录：
[2013-02-18 23:32:36] myapp.INFO: Matched route "GET_hello" (parameters: "_controller": "{}", "_route": "GET_hello") [] []
[2013-02-18 23:32:36] myapp.INFO: Populated SecurityContext with an anonymous Token [] []
[2013-02-18 23:32:36] myapp.INFO: > GET /web/hello [] []
[2013-02-18 23:32:36] myapp.INFO: < 200 [] []
[2013-02-18 23:32:36] myapp.DEBUG: Write SecurityContext in the session [] []
[2013-02-18 23:32:36] myapp.CRITICAL: RuntimeException: Failed to start the session
because headers have already been sent. (uncaught exception) at
/home/account/public_html/mydomain.com/vendor/symfony/http-
foundation/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php
line 142 [] []
[2013-02-18 23:32:36] myapp.INFO: < 500 [] []
[2013-02-18 23:32:36] myapp.DEBUG: Write SecurityContext in the session [] []
更新2
我的网站提供商似乎在加载sqlite库时遇到问题。我从Silex文档中注意到sqlite存在依赖性。在我的网站提供商上查看的问题如下：
[18-Feb-2013 23:36:15 UTC] PHP Warning: PHP Startup: Unable to load
dynamic library '/usr/local/php54/lib/php/extensions/no-debug-non-zts-20100525/sqlite.so'
- /usr/local/php54/lib/php/extensions/no-debug-non-zts-20100525/sqlite.so: cannot open
shared object file: No such file or directory in Unknown on line 0
我正在研究这个问题并想知道这个错误是否会阻止Session程序执行它的任务，这可以解决这个问题。