Error with ref

[Hammond2789]

Uncaught Invariant Violation: Element ref was specified as a string (wrapper) but no owner was set. This could happen for one of the following reasons:

1. You may be adding a ref to a function component
2. You may be adding a ref to a component that was not created inside a component's render method
3. You have multiple copies of React loaded

I used the example from the demo.

import ResizePanel from "react-resize-panel";

left panel

[bjgrosse]

Hi Hammond, can you give the steps to reproduce the error?

[Hammond2789]

Ah I did but the site has added it as actual HTML. I just copy and pasted from the demo.

<ResizePanel direction="e">
    <div className="panel sidebar">left panel</div>
</ResizePanel> 

[bjgrosse]

Can you paste the code for the entire component so I can reproduce here?