Internal variable "!ENDTIME" not supported

Trying to follow the steps for “Performance Monitoring/Testing” (https://a9t9.com/kantu/docs), getting

[error] Internal variable “!ENDTIME” not supported

Can somebody help!!!

The variable name is !RUNTIME - it contains the macro runtime.

Example: The DemoDownload macro that ships with Kantu uses it to calculate the time it takes to download a file.