اطلاعات کامل بدید که بشه کمک کرد

Exception has occurred.

DioException (DioException [bad response]: This exception was thrown because the response has a status code of 404 and RequestOptions.validateStatus was configured to throw for this status code. The status code of 404 has the following meaning: "Client error - the request contains bad syntax or cannot be fulfilled" Read more about status codes at https://developer.mozilla.org/en-US/docs/Web/HTTP/Status In order to resolve this exception you typically have either to verify and fix your request code or you have to fix the server code. )

وقتی ۴۰۴ برمیگرده یعنی چنین مسیری وجود نداره. دقت کنید ببینید ادرس رو درست وارد کردید ویا غلط تایپی و.. ندارد