CI 控制器的错误提示 没有提示

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新手求解答
CI 框架index.php  若里面调用一个没有定义的方法 a()然后打开XXX .com/index.php  会提示调用一个未定义的方法。

但是若在login控制器中调用a（），打开只提示
An error occurred.

Sorry, the page you are looking for is currently unavailable.
Please try again later.

If you are the system administrator of this resource then you should check the error log for details.

Faithfully yours, nginx.


新手求解答