codeigniter 3.1升级显示错误配置文件url.php不存在

Question

codeigniter 3.1 升级显示错误配置文件 url.php 不存在。而日志文件未显示确切错误。这是日志详细信息

INFO - 2017-05-14 22:11:57 --> Config Class Initialized
INFO - 2017-05-14 22:11:57 --> Hooks Class Initialized
DEBUG - 2017-05-14 22:11:57 --> UTF-8 Support Enabled
INFO - 2017-05-14 22:11:57 --> Utf8 Class Initialized
INFO - 2017-05-14 22:11:57 --> URI Class Initialized
DEBUG - 2017-05-14 22:11:57 --> No URI present. Default controller set.
INFO - 2017-05-14 22:11:57 --> Router Class Initialized
INFO - 2017-05-14 22:11:57 --> Output Class Initialized
INFO - 2017-05-14 22:11:57 --> Security Class Initialized
DEBUG - 2017-05-14 22:11:57 --> Global POST, GET and COOKIE data sanitized
INFO - 2017-05-14 22:11:57 --> CSRF cookie sent
INFO - 2017-05-14 22:11:57 --> Input Class Initialized
INFO - 2017-05-14 22:11:57 --> Language Class Initialized
INFO - 2017-05-14 22:11:57 --> Loader Class Initialized

Answer 1

转到config/autoload.php

在帮助部分输入此代码

$autoload['helper'] = array('url','form');