FORCDK-DRAG-DROP-001

[forty-cdk/drag-drop] FORCDK-DRAG-DROP-001: {piece} must be used inside a [forDropList] element.

Cause

No FOR_DROP_LIST_CONTEXT provider is visible from {piece}. Angular resolves a directive's dependencies at the template's declaration site rather than where it is stamped, so a piece declared in an ng-template outside the root resolves nothing even when it renders inside it.

Fix

Move {piece} inside a [forDropList] element, declaring any ng-template it lives in there too.

Where it comes from

projects/forty-cdk/drag-drop/src/drag-drop-context.ts:218

Read the drag-drop documentation

A value in braces is filled in when the message is reported, so the sentence in your console names the piece, input or value that failed.