there has been an error processing your request message on installing Magento solution

Go and follow these steps to remove your error:

   i>  Navigate to the "errors" folder.

  ii>  Change local.xml.sample to local.xml

    You should now see a new list of crazy errors all over the Magento page - this is okay.

   iii> Open magento/lib/Zend/Cache/Backend/File.php and look for:
    protected $_options = array(
    'cache_dir' => 'null',
    Change it to:
    protected $_options = array(
    'cache_dir' => 'tmp/',

 iv>   Save it.
    Now the final step is to go create a tmp folder in the root Magento folder.
    That's it.