Please guide to resolve following issue
exit: 255
PHP Warning: PHP Startup: Unable to load dynamic library ‘/usr/lib/php/modules/pcntl.so’ - /usr/lib/php/modules/pcntl.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Fatal error: Cannot redeclare class ext_gosub in /var/www/html/admin/libraries/extensions.class.php on line 471
1 error(s) occurred, you should view the notification log on the dashboard or main screen to check for more details.
Asterisk (Ver. 1.6.2.10):
PHP Version 5.1.6