You are using an older version of AG Grid. To upgrade, please see the
migration guide.
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.
can not expand a column item that does not represent a column group header
To show this error text in the dev console, import the ValidationModule.
Related Doc Pages
The following documentation pages should provide additional context / guidance on how to
resolve this error.