Controlling the height of the nivo slider

Fatal error: Uncaught Error: Call to undefined function oik_custom_css() in /home/oikplugi/public_html/wp-content/plugins/oik/shortcodes/oik-bob-bing-wide.php:185 Stack trace: #0 /home/oikplugi/public_html/wp-content/plugins/oik/oik-add-shortcodes.php(207): bw_editcss(Array, '', 'bw_editcss') #1 /home/oikplugi/public_html/wp-includes/shortcodes.php(319): bw_shortcode_event(Array, '', 'bw_editcss') #2 /home/oikplugi/public_html/wp-content/plugins/oik-css/includes/shortcodes-earlier.php(100): do_shortcode_tag(Array) #3 [internal function]: do_shortcode_tag_earlier(Array) #4 /home/oikplugi/public_html/wp-content/plugins/oik-css/includes/shortcodes-earlier.php(82): preg_replace_callback('/\\[(\\[?)(wp_cap...', 'do_shortcode_ta...', 'If you have lim...') #5 /home/oikplugi/public_html/wp-includes/class-wp-hook.php(286): do_shortcode_earlier('If you have lim...') #6 /home/oikplugi/public_html/wp-includes/plugin.php(203): WP_Hook->apply_filters('If you have lim...', Array) #7 /home/oikplugi/public_html/wp-includes/post-template.p in /home/oikplugi/public_html/wp-content/plugins/oik/shortcodes/oik-bob-bing-wide.php on line 185