<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function return_error() in /var/www/modx-kassa/core/cache/includes/elements/modsnippet/11.include.cache.php:21
Stack trace:
#0 /var/www/modx-kassa/core/model/modx/modscript.class.php(70): include()
#1 /var/www/modx-kassa/core/model/modx/modparser.class.php(536): modScript-&gt;process(NULL)
#2 /var/www/modx-kassa/core/model/modx/modparser.class.php(250): modParser-&gt;processTag(Array, true)
#3 /var/www/modx-kassa/core/model/modx/modresponse.class.php(69): modParser-&gt;processElementTags('', '&lt;!doctype html&gt;...', true, false, '[[', ']]', Array, 9)
#4 /var/www/modx-kassa/core/model/modx/modrequest.class.php(137): modResponse-&gt;outputContent(Array)
#5 /var/www/modx-kassa/core/model/modx/modrequest.class.php(121): modRequest-&gt;prepareResponse()
#6 /var/www/modx-kassa/core/model/modx/modx.class.php(1399): modRequest-&gt;handleRequest()
#7 /var/www/modx-kassa/index.php(57): modX-&gt;handleRequest()
#8 {main}
  thrown in <b>/var/www/modx-kassa/core/cache/includes/elements/modsnippet/11.include.cache.php</b> on line <b>21</b><br />