Column '{colId}' classWhen['{class}'] threw.

Warnings reference › classwhen-fn:*:*

Identifier

classwhen-fn:*:*

Raised by

The grid (rendering)

Since

1.0.1

What happened

A classWhen predicate threw, which is treated as "does not apply": the class is not added to that cell and painting continues. Reported once per column and class, so one broken predicate is one line.

The fix

The error is attached to the console line. The predicate must return true to apply the class; anything else, including a throw, means it does not.

Reference

Covered in full at the API reference.