There are two scenarios possible.
1. Either you have downloaded the wrong widget. Or the widget you have downloaded is not compatible with
your current mendix version. You can simply delete or right click and update the widget.
2. You might have placed the widget wrongly in your modeler. In this case you can delete and download again
with stable version compatible with your current version.
I suggest you delete it and the jar files, which are causing the conflicts and the reinstall the same widget.
Hope this works in your case. Let me know if you have any questions around it. If it helps please accept the answer.
All the best.