Typescript ReactJS中对象数组的类型错误并且没有数据

其实我有两个问题.首先，当我试图解决Lesson时，我得到了

"Type 'Lesson | Lesson[]' is not assignable to type 'Lesson'.
  Type 'Lesson[]' is missing the following properties from type 'Lesson': name, note, hour, startDate, and 2 more."

父组件中的错误 这是我的父母公司.

import React, { useState, useEffect } from 'react'
import { Lesson } from './LessonType'
import NewLessonModal from './NewLesson';
function LessonList() {
    const [lessons, setLessons] = useState<Lesson[]>([]);
    const url = "https://localhost:7065/api/Lessons"
    const addLesson = (lesson: Lesson[]) => {
        setLessons([...lessons, lesson])
        console.log(lesson)
    }
}
    return (
        <div>
            <NewLessonModal addLesson={addLesson} />
        </div>
    )

}

这是我的子元素公司.

import { ChangeEvent, useState } from "react";
import { Lesson } from './LessonType'
type Props = {
    addLesson(lessonData: Lesson[]): void
}
function NewLessonModal({ addLesson }: Props) {
    const [name, setname] = useState<string>("")
    const [notes, setnotes] = useState<string>("")
    const [startDate, setstartDate] = useState<string>("")
    const [endDate, setendDate] = useState<string>("")
    const [hour, sethour] = useState<number>(0)
    const [certificate, setcertificate] = useState<string>("")
    const [imagePath, setimagePath] = useState<string>("")
    const [lessonData, setLessonData] = useState<Lesson[]>([])

    const changeValue = (event: ChangeEvent<HTMLInputElement>) => {
        if (event.target.name === "name") {
            setname(event.target.value)
        }
        if (event.target.name === "notes") {
            setnotes(event.target.value)
        }
        if (event.target.name === "startDate") {
            setstartDate(event.target.value)
        }
        if (event.target.name === "endDate") {
            setendDate(event.target.value)
        }
        if (event.target.name === "hour") {
            sethour(Number(event.target.value))
        }

    }
    const addNewLesson = () => {
        setLessonData([
            ...lessonData,
            { name: name, note: notes, startDate: startDate, endDate: endDate, hour: hour, certificate: certificate, imagePath: imagePath }
        ]);
        addLesson(lessonData)
    }
return ....

课程类型文件为

export interface Lesson{
   name:string,
   note:string,
   imagePath?:string,
   hour:number,
   startDate:string,
   endDate:string,
   certificate:string,
   id?:number,
   createdDate?:string 
}

我无法修复此类型错误，我try 将数据传递给父组件.对象的第一个数组没有数据.第二遍数据处理我在父组件中获得第一个数据