The Template cannot be properly parsed.

[aughtknoll]

static TiledObject parse(Parser parser) {
...
final template = parser.getSingleChildOrNullAs('template', Template.parse);
...
}

static Template parse(Parser parser) {
return Template(
tileSet: parser.getSingleChildOrNullAs('tileset', Tileset.parse),
object: parser.getSingleChildOrNullAs('object', TiledObject.parse),
);
}

Template is provided as a file, but the file is not loaded here.

[spydon]

Are you getting any errors or stack traces?