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.

> Please update. In my project, "json_model" and "json_serializable" all the latest version. But it still failed after I do packages get. 

嗯，是固定的高度。