There is no WaitFor in the VLC Driver for V-Control 4.0, only in V-Control 3.x
The VLC driver needs an update to work with all features in V-Control 4.
Because of a different architecture, there are no WaitFor commands in V-Control 4 device drivers any more. Instead use “Wait For Variable” (click right in a cuelist and select this command).
https://v-control.com/wiki/doku.php/tasksgeneral#wait_for_variable
However, the VLC driver in V-Control 4 has no device variables at this time).
You can update the driver by yourself if you are able to do so (read the documentation, and look at other drivers with a _v4 extension, there you can learn how to do this).
Of course you can also use our paid service and pay for a new VLC driver.