Getting error 'variant constructor can't be found' while compiling - reason

Question

I was trying out use a sortable list component (react-sortable-hoc) on a ReasonReact project. But I ran into an error which I was trying to figure out for couple of hours.
Steps I followed:
made the #bs binds for sortableContainer() and sortableElement() for the module react-sortable-hoc
faked the reactClass returned by the both functions and put it under file SortableContainer.js and SortableElement.js
Made an another React component called Todolist which use the component SortableContainer, and SortableContainer use the component SortableElement.
Code Snippet
/* SortableContainer.re */
[#bs.val] [#bs.module "react-sortable-hoc"] external sortableContainer : 'a =>
ReasonReact.reactClass = "";
let sortableContainerReactClass: ReasonReact.reactClass = sortableContainer(() => {
(ReasonReact.createElement(SortableElement))
});
let make = (children) =>
ReasonReact.wrapJsForReason(
~reactClass=sortableContainerReactClass,
~props = { "onSortEnd": () => {} },
children
);
/* SortableElement.re */
[#bs.val] [#bs.module "react-sortable-hoc"] external sortableElement : 'a =>
ReasonReact.reactClass = "";
let sortableElementReactClass: ReasonReact.reactClass = sortableElement(() => {
(ReasonReact.stringToElement("testing is good"))
});
let make = (children) =>
ReasonReact.wrapJsForReason(
~reactClass=sortableElementReactClass,
~props = { "onSortEnd": () => {} },
children
);
/* List.re */
let component = ReasonReact.statelessComponent("List");
let make = (~items=[||], _children) => {
{
...component,
render: (_self) => {
}
}
};
When I compile this code I get this error.
# ERROR
We've found a bug for you!
/Users/jaisonjustus/code/todotabre/src/components/SortableContainer.re 5:34-48
3 │
4 │ let sortableContainerReactClass: ReasonReact.reactClass = sortableConta
iner(() => {
5 │ (ReasonReact.createElement(SortableElement))
6 │ });
7 │
The variant constructor SortableElement can't be found.
- If it's defined in another module or file, bring it into scope by:
- Annotating it with said module name: let food = MyModule.Apple
- Or specifying its type: let food: MyModule.fruit = Apple
- Constructors and modules are both capitalized. Did you want the latter?
Then instead of let foo = Bar, try module Foo = Bar.
What's wrong in this code?