下载CodeIgniter v3后，现在我收到此错误：
A PHP Error was encountered
Severity: Core Warning
Message: PHP Startup: Unable to load dynamic library '/usr/local/php-5.6/extensions/json.so' - /usr/local/php-5.6/extensions/json.so: cannot open shared object file: No such file or directory
Filename: Unknown
Line Number: 0
Backtrace:
我的地址：
http://vitrinsaz1.ir/Mobile/Vitrinsaz/Pannel/index.php/welcome