If you have installed oik-nivo-slider version 1.7 and oik version 1.17 AND are running your website on a version of PHP lower than 5.3.3, then you could get the following Warning message from the [nivo] shortcode.
Warning: json_encode() expects exactly 1 parameter, 2 given in /wp-content/plugins/oik/bobbfunc.inc on line
This post offers three solutions.
This is the best long term solution as this will allow the oik base plugin to use the functionality implemented in PHP 5.3.3 for the json_encode() API
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