Fatal error: Incompatible file format: The encoded file has format major ID 3, whereas the Loader expects 4 in /home/username/public_html/index_enc_zend.php on line 0
Solution :
1 ) Upgrade cube cart
2) Edit the below file in document root folder.
change the line as mentioned belowvi includes/global.inc.php
toglob['encoder'] = 'zend';
glob['encoder'] = 'ioncube';