unknown QR error-correction level "{level}";...

Warnings reference › qrcode:level:*

Identifier

qrcode:level:*

Raised by

The grid (rendering)

Since

1.0.1

What happened

The QR renderer was given an error-correction level it does not know, so it used M. The level decides how much of a damaged or partially covered symbol can still be read, so an unrecognised value is named rather than silently downgrading redundancy.

The fix

Use 'L', 'M', 'Q' or 'H'.

The smallest fix

columns: [{ id: 'url', cell: { render: 'qrcode', level: 'H' } }]

Reference

Covered in full at the API reference.