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The grid (rendering) ยท console.warn

An icon must be a name, a character, or element markup; got {type} at {key}.

Printed by The grid (rendering), prefixed [lattice], since 1.15.0.

Warnings referenceicon:type:*

Identifier
icon:type:*
Raised by
The grid (rendering)
Since
1.15.0

What happened

The value in an icon slot was not a string, so it can be none of the three things an icon may be. The slot is left empty.

The fix

Pass a registered icon name, a single character, or the markup for an element.

Reference

Covered in full at the API reference.