Blank Page When Install OJS

Sory for my bad english, i was trying to install OJS on my hosting ojs.jurnalpeluang.id , URL appear is : http://ojs.jurnalpeluang.id/index.php/index/install , but blankscreen in browser.

this is error log :

[17-May-2016 00:32:05 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 00:33:58 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 00:34:44 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 00:34:47 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 00:35:16 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 00:48:23 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 00:53:13 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 00:55:27 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 00:58:38 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 00:58:41 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 01:02:20 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 01:26:53 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 01:26:56 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 01:27:25 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 02:08:21 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql
[17-May-2016 02:08:58 Asia/Jakarta] ojs2 has produced an error
Message: WARNING: get_cfg_var() has been disabled for security reasons
In file: /home/jurnalpeluang/public_html/ojs/classes/install/form/InstallForm.inc.php
At line: 122
Stacktrace:
Server info:
OS: Linux
PHP Version: 5.4.45
Apache Version: N/A
DB Driver: mysql

Please, i need help!

It looks like get_cfg_var() has been added to the disabled functions list in php.ini.

You’ll need to check with your hosting provider about relaxing this restriction.

Alternately, since it appears the only usage of get_cfg_var() is here:

And, since I think ini_get() would have been the better choice, you might try replacing the get_cfg_var() calls with ini_get() calls, if you are comfortable with PHP.