Richtext Widget option for Template Variable - Evo 10.12

I am having a problem with Richtext Widget option for Template Variable for Evo 10.12. I get this error on the page that has the TV with RT Widget:


"Error : array_key_exists(): The first argument should be either a string or an integer
ErrorType[num] : WARNING[2]
File : /home/adlm/www/manager/includes/document.parser.class.inc.php
Line : 884
Source : if (array_key_exists($matches[1][$i], $this->config))


Anyone have a clue as to why this happens?