Menu Component/GoogleVR/Update Stereo Cameras can't be checked because doesn't exist.

This bug has already been reported here, please shoot out a comment there: https://issuetracker.unity3d.com/issues/selecting-custom-menuitem-from-component-tab-results-in-cant-be-checked-because-doesnt-exist-error-message

EDIT: I managed to solve this.

You need to remove the "Component" from the menu entry path and have something like this:

 [MenuItem("GoogleVR/Update Stereo", false, 40)]

• Because it looks like now on latest Unity versions, to be able to simply add a contextual component, we need to use this tag instead: Use this before the class

  [AddComponentMenu("GoogleVR/Update Stereo")]