Error when importing module

[ghost]

Hi, I installed this library with npm install --save react-sortable-tree-theme-minimal as you said on your first page.
After installing, I got directly a warning that react-sortable-tree is not installed and that I would need at least version 1.4.0. You can see the result of running the command in the picture below.

I have already installed sortable-tree with version ^2.6.2, so this warning above seems wrong.

After importing the module as shown in your doc, I got the error you can see here:

For additional information: I am running a create-react-app with following versions:
` "@types/react-sortable-tree": "^0.3.6",

"react": "^16.8.6",
"react-dom": "^16.8.6",
"react-scripts": "3.0.1",
"react-sortable-tree": "^2.6.2",
"react-sortable-tree-theme-minimal": "0.0.14",
"typescript": "3.2.1"`