Kotlin Ktor无法使用位置数据类获取提交数据

import io.ktor.application.*
import io.ktor.features.ContentNegotiation
import io.ktor.features.StatusPages
import io.ktor.http.HttpStatusCode
import io.ktor.jackson.jackson
import io.ktor.request.receiveParameters
import io.ktor.response.respond
import io.ktor.routing.*
import io.ktor.server.engine.embeddedServer
import io.ktor.server.netty.Netty

data class UserData(val name: String, val age: Int)

fun Application.module() {
    install(ContentNegotiation) {
        jackson {
            // 配置Jackson序列化/反序列化
        }
    }

    install(StatusPages) {
        // 配置错误处理
    }

    routing {
        post("/user") {
            val params = call.receiveParameters()
            val name = params["name"]
            val age = params["age"]?.toIntOrNull()

            if (name != null && age != null) {
                val userData = UserData(name, age)
                call.respond(HttpStatusCode.OK, userData)
            } else {
                call.respond(HttpStatusCode.BadRequest, "Invalid data")
            }
        }
    }
}

fun main() {
    embeddedServer(Netty, port = 8080, module = Application::module).start(wait = true)
}