JavaScript Data GridAG Grid Error #56

Full Error Text

Full error message cannot be shown because there are missing parameters in the URL. Please follow the full link from the developer tool logs.
addRowDropZone - target already exists in the list of DropZones. Use `removeRowDropZone` before adding it again.
To show this error text in the dev console, import the ValidationModule.

The following documentation pages should provide additional context / guidance on how to resolve this error.