不能将“动态”类型的值分配给“字符串”类型的变量

Question

“dynamic”类型的值不能分配给“String”类型的变量。 尝试更改变量的类型，或将右侧类型转换为 'String'.dart(invalid_assignment)

// Get Playlist Videos
var response = await http.get(uri, headers: headers);
if (response.statusCode == 200) {
  var data = json.decode(response.body) as Map<String, dynamic>;

  _nextPageToken = data['nextPageToken'] ?? '' ;
  List<dynamic> videosJson = data['items'];