Unable to drag cell inside row

@artf Could you please take a look at this. On deleting a cell and trying to add a new cell from the blocks manager, it gives the following error: "Invalid target position: Target collection not found, Target is not droppable, accepts [undefined], Component not draggable, acceptable by [undefined]". These are my cell and row components: comps.addType("cell", { isComponent: el => el.tagName == "TD", model: cellType.model.extend({ defaults: { ...cellType.model.prototype.defaults, name: 'mycell', draggable: ['tr'], droppable: true, resizable: true, removable: true, select: true, }) }); comps.add...