Magento install error - Exception printing is disabled

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

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:

1. Navigate to the "errors" folder.
2. Change local.xml.sample to local.xml
3. You should now see a new list of crazy errors all over the Magento page - this is okay.
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.