no band "{id}" to add to; nothing was grouped.

Warnings reference › columns.group.unknown:*

Identifier

columns.group.unknown:*

Raised by

The grid (core)

Since

1.29.0

What happened

groupColumns(ids, { groupId }) adds columns to an existing band, and no band has that id. Nothing was grouped and no band was created - the groupId option never creates one.

The fix

Use the id option to create a band with a chosen id, or pass the id of a band that exists.

The smallest fix

grid.columns.groupColumns(['q1', 'q2'], { id: 'revenue' });

Reference

Covered in full at the API reference.