unity 2021 Controller trigger button in game window doesn't work

[Vinilcari1687]

I am creating a project where the 3D space in VR needs to be measured. If we select two points, the distance between them must be shown.

I have written a script and it shows no error but gives the warning below.

The referenced script (Line_measurement) on this Behaviour is missing!

Below are the images of the packages installed 

1. VIVE OpenXR Plugin - Android
2. XR Interaction Toolkit
3. VIVE Wave XR Plugin

Could someone please offer help?