如何显示Magento 错误信息！Magento install error – Exception printing is disabled

Here is a known error which can occur when installing Magento:

当安装Magento时，这里有一个众所周知的错误提示

There has been an error processing your request
Exception printing is disabled by default for security reasons.
Error log record number: XXXXXXXXXXXXXXX

Here is the solution:

解决办法是：

1. Navigate to the /errors/ folder.（进去magento的error文件夹）
2. Change local.xml.sample to local.xml（把local.xml.sample改名为local.xml）
3. You should now see a new list of crazy errors all over the Magento page – this is okay.（刷新之前的错误页面，你应该能看到错误Magento页面上的错误信息）
4. Open magento/lib/Zend/Cache/Backend/File.php and look for:

protected $_options = array(
‘cache_dir’ => ‘null’,

5. Change it to:

protected $_options = array(
‘cache_dir’ => ‘tmp/’,

6. Save it.
7. Now the final step is to go create a tmp folder in the root Magento folder.
8. That’s it.