Starting and stopping Coroutines

Hi all,

I'm trying to make a subtitle system where:

1. text is displayed

2. for an amount of time

3. after which, it disappears

4. OR the player can click to make it disappear

5. There can be a chain of text

The class for the text and time:

 class SubtitleThread (MonoBehaviour):
     public text as string
     public timer as single = 5.0

The class to manage it:

 class SubtitleSystem (MonoBehaviour): 
     public static showSubtitle as bool = false
     public static subtitleText as string = ""

     def PlaySubtitle (subtitleThreads as (SubtitleThread)) as System.Collections.IEnumerator:
         for eachThread in subtitleThreads:
             yield StartCoroutine("PlaySubtitleCR", eachThread)
             showSubtitle = false
             subtitleText = ""
 
     def PlaySubtitleCR (oneThread as SubtitleThread) as System.Collections.IEnumerator:
         subtitleText = oneThread.text
         showSubtitle = true
         yield WaitForSeconds(oneThread.timer)

     def ClearSubtitle ():
         StopCoroutine("PlaySubtitleCR")
 

Clicking while `showSubtitle == true` will call `ClearSubtitle()`.

However, this does not seem to work. PlaySubtitle will not run when called, and I'm not sure why. When I comment out the "yield" line, it will run - but without the time and "click to continue" functionality.

Any help would be greatly appreciated. Thank you.