Less_Exception_Compiler: variable @ap24_color_2_tone_2 is undefined in file /data/sites/web/vroegtijdigezorgplanningbijd4631/subsites/gbc-music.org/web/app/themes/vzp-child/assets/less/layouts/header/_header.less in _header.less on line 3, column 17
1| @media only screen and (min-width:992px){
2|   header#main_header {
3|     background: @ap24_color_2_tone_2;
4|     position: fixed;
5|     z-index: 1000;
6|     color:#000; in main.less in main.less in main.less in main.less in main.less in /data/sites/web/vroegtijdigezorgplanningbijd4631/subsites/gbc-music.org/web/app/plugins/pm-short-codes/lib/Less/Tree/Mixin/Call.php:130
Stack trace:
#0 /data/sites/web/vroegtijdigezorgplanningbijd4631/subsites/gbc-music.org/web/app/plugins/pm-short-codes/lib/Less/Tree/Ruleset.php(147): Less_Tree_Mixin_Call->compile(Object(Less_Environment))
#1 /data/sites/web/vroegtijdigezorgplanningbijd4631/subsites/gbc-music.org/web/app/plugins/pm-short-codes/lib/Less/Tree/Ruleset.php(88): Less_Tree_Ruleset->EvalMixinCalls(Object(Less_Tree_Ruleset), Object(Less_Environment), 156)
#2 /data/sites/web/vroegtijdigezorgplanningbijd4631/subsites/gbc-music.org/web/app/plugins/pm-short-codes/lib/Less/Parser.php(196): Less_Tree_Ruleset->compile(Object(Less_Environment))
#3 /data/sites/web/vroegtijdigezorgplanningbijd4631/subsites/gbc-music.org/web/app/plugins/pm-short-codes/lessc.inc.php(161): Less_Parser->getCss()
#4 /data/sites/web/vroegtijdigezorgplanningbijd4631/subsites/gbc-music.org/web/app/themes/vzp-child/styles.css.php(23): lessc->compileFile('assets/less/mai...')
#5 {main}