Install Error verison

[maulikvrl2010]

i am trying to install abantecart version 1.2.16 but it's show warring and errors .

warning: Undefined array key "rt" in /home/fs5k4n1dokjd/public_html/.../core/init.php on line 81warning: Undefined array key 0 in /home/fs5k4n1dokjd/public_html/.../core/lib/error.php on line 114error: Uncaught Error: Undefined constant "IS_ADMIN" in /home/fs5k4n1dokjd/public_html/.../core/lib/exceptions/exception.php:93 Stack trace: #0 /home/fs5k4n1dokjd/public_html/.../core/lib/exceptions.php(111): AException->showErrorPage() #1 /home/fs5k4n1dokjd/public_html/.../core/lib/exceptions.php(59): ac_exception_handler() #2 /home/fs5k4n1dokjd/public_html/.../core/lib/error.php(114): ac_error_handler() #3 /home/fs5k4n1dokjd/public_html/.../core/lib/exceptions/exception.php(76): AError->toLog() #4 /home/fs5k4n1dokjd/public_html/.../core/lib/exceptions.php(109): AException->logError() #5 [internal function]: ac_exception_handler() #6 {main} thrown in /home/fs5k4n1dokjd/public_html/.../core/lib/exceptions/exception.php on line 93

How to solve this error 

[abantecart]

What is your PHP version? Are you use all files from original source and not modified?

[maulikvrl2010]

It's PHP version error where is not match with Abantecart 1.2.16 so i change my php version and it's solve

Thanks & Regrades
Maulik