Explanation: A function can accept an input "term" that has a given "type", like
this:


        This is the input term that the function accepts
        ⇩
    ┌───────────────────────┐
    │ ∀(x : Natural) → Bool │  This is the type of a function that accepts an
    └───────────────────────┘  input term named ❰x❱ that has type ❰Natural❱
            ⇧
            This is the type of the input term


    ┌────────────────┐
    │ Bool → Integer │  This is the type of a function that accepts an anonymous
    └────────────────┘  input term that has type ❰Bool❱
      ⇧
      This is the type of the input term


... or a function can accept an input "type" that has a given "kind", like this:


        This is the input type that the function accepts
        ⇩
    ┌────────────────────┐
    │ ∀(a : Type) → Type │  This is the type of a function that accepts an input
    └────────────────────┘  type named ❰a❱ that has kind ❰Type❱
            ⇧
            This is the kind of the input type


    ┌──────────────────────┐
    │ (Type → Type) → Type │  This is the type of a function that accepts an
    └──────────────────────┘  anonymous input type that has kind ❰Type → Type❱
       ⇧
       This is the kind of the input type


Other function inputs are $_NOT valid, like this:


    ┌──────────────┐
    │ ∀(x : 1) → x │  ❰1❱ is a "term" and not a "type" nor a "kind" so ❰x❱
    └──────────────┘  cannot have "type" ❰1❱ or "kind" ❰1❱
            ⇧
            This is not a type or kind


    ┌──────────┐
    │ True → x │  ❰True❱ is a "term" and not a "type" nor a "kind" so the
    └──────────┘  anonymous input cannot have "type" ❰True❱ or "kind" ❰True❱
      ⇧
      This is not a type or kind


You annotated a function input with the following expression:

↳ $txt

... which is neither a type nor a kind