<Android Kotlin AlertDialog.Builder() usage and co...

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Android Kotlin AlertDialog.Builder() usage and context. "this" not working
This is my very first time using Kotlin/Android App Development, so I apologise if I am missing something simple. I have a background in Java and C#.
I'm trying to display an AlertBox containing X information. All the tutorials I am reading/watching stay that the constructor should be:
val builder = AlertDialog.Builder(this)

This issue I am having trouble with is the "this" part. I get a Type Mismatch error for the "this" reference.
I have tried searching for a solution and I find variations...