When I am trying to install CODO FORUM in localhost its showing below mentioned error.

Unable to require C:\wamp\www\codoforum/sys//JsonSerializable.php
Fatal error: Interface 'JsonSerializable' not found in C:\wamp\www\codoforum\sys\vendor\illuminate\support\Illuminate\Support\Collection.php on line 14

So, please let me know how to solve the issue.

Thanks

When I installed on CentOS 6 I had to upgrade from PHP 5.3 to 5.5 to get rid of that same error.

You are using an older version of PHP

Codoforum only supports PHP V5.4 or greater.

The website says 5.3 when I check the forum requirements. But thank you if this is the cause it will solve my issue as well.