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按照网上视频教程"30分钟开发OpenERP 功能模块"，在7.0和8.0中做，总是做不成，大神们帮忙给看一下呀，我怀疑是代码bug。
视频网址：
[检测到链接无效，已移除]
注：
在建立菜单那一步骤需要多建立一级菜单
我建立的是三层菜单，课程管理》》课程》》课程界面，按照视频上建立两层菜单出不来界面的。
在建立完菜单后，在界面中新建课程时出现下面错误提示：


OpenERP Server Error
Traceback (most recent call last):
  File "D:\GreenOpenERP-8.0-latest-win-x86\openerp\http.py", line 348, in dispatch
    response["result"] = self.call_function(**self.params)
  File "D:\GreenOpenERP-8.0-latest-win-x86\openerp\http.py", line 220, in call_function
    return checked_call(self.db, *args, **kwargs)
  File "D:\GreenOpenERP-8.0-latest-win-x86\openerp\service\model.py", line 113, in wrapper
    return f(dbname, *args, **kwargs)
  File "D:\GreenOpenERP-8.0-latest-win-x86\openerp\http.py", line 215, in checked_call
    return self.func(*a, **kw)
  File "D:\GreenOpenERP-8.0-latest-win-x86\openerp\http.py", line 532, in call
    return self.method(*args, **kw)
  File "D:\GreenOpenERP-8.0-latest-win-x86\openerp\addons\web\controllers\main.py", line 1217, in call_kw
    return self.call_kw(model, method, args, kwargs)
  File "D:\GreenOpenERP-8.0-latest-win-x86\openerp\addons\web\controllers\main.py", line 1209, in call_kw
    return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs)
  File "D:\GreenOpenERP-8.0-latest-win-x86\openerp\osv\orm.py", line 4111, in create
    tuple([f[2] for f in columns if len(f) > 2])
  File "D:\GreenOpenERP-8.0-latest-win-x86\openerp\sql_db.py", line 153, in wrapper
    return f(self, *args, **kwargs)
  File "D:\GreenOpenERP-8.0-latest-win-x86\openerp\sql_db.py", line 218, in execute
    res = self.obj.execute(query, params)
ProgrammingError: column "x_startdate" of relation "x_lesson" does not exist
LINE 1: INSERT INTO "x_lesson" ("id", "x_startdate", "x_enddate", "x...
                                      ^
提示上说：x_startdate等不存在，或者关系x_lesson不存在，我看了，确实确实是存在的，都是我创建的呀。。。。

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[color=red]感谢开发群  上海-Joshua  大神的无私帮助，初步诊断，大神怀疑有个模块有bug，因时间太晚，明天继续诊断
请其他大神帮忙按照上面链接中的教程走一遍试试，openerp的发展离不开大神们的帮助，谢谢你们，辛苦了。[/color]