litepal无法找到创建的表

在尝试用litepal实现登录注册，但是无法成功建表

litepal.xml
<?xml version="1.0" encoding="utf-8"?>
<litepal>
    <dbname value="User" />

    <version value="1" />

    <list>
        <mapping class="com.example.test3.UserData"/>
    </list>

</litepal>

userdata:
package com.example.test3;

import org.litepal.crud.LitePalSupport;

public class UserData extends LitePalSupport {
    private String username;
    private String password;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test3/com.example.test3.Main}: org.litepal.exceptions.DatabaseGenerateException: can not find a class named com.example.test3.UserData

有没有混淆