To resolve this issue. Please refer following steps.
1.Login to cPanel >> File Manager
2.Go to folder errors then change/rename the file local.xml.sample to local.xml.
3.Then under file /lib/Zend/Cache/Backend/File.php change the following valu from null to tmp.
protected $_options = array(
'cache_dir' => 'null',
Change this to
protected $_options = array(
'cache_dir' => 'tmp/',
4.save the file
5.Create a tmp folder in the root Magento folder.
Thats it.
Regards,
Nathan.