执行packages get的时候报错

[GanZhiXiong]

json_serializable ^2.0.0, json_serializable ^2.0.0 is required. So, because flutter_dayi depends on json_serializable ^3.0.0, version solving failed. pub get failed (1)

你可能需要升级你的json_serializable版本了

[bluecapricorn]

我同时引用了json_serializable和json_annotation的最新版本，也是报类似这样的错；然后把版本号降到2.0.X，还是不行。

Because every version of json_model depends on json_annotation ^2.2.0 and web_socket depends on json_annotation ^3.0.0, json_model is forbidden.

So, because web_socket depends on json_model ^0.0.2, version solving failed.