Sometimes the vTiger installation cannot be completed successfully because the database is not populated with the needed data. To avoid this issue, prior to installing vTiger, you can make a small modification to the install.php file. The line you should modify is:
ini_set("zend.ze1_compatibility_mode", "1");
Change it to:
ini_set("zend.ze1_compatibility_mode", "0");
and the installation should be completed successfully 
You can modify the install.php file using the File Manager in your cPanel.
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