＆＃34;对象引用未设置为对象的实例＆＃34;构建引用Oracle.DataAccess的网站

Question

我有一个新创建的ASP.net网站;它建立得很好：

如果我更新web.config以引用Oracle.DataAccess.dll库：

<assemblies>
    <add assembly="Oracle.DataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89B483F429C47342"/>
</assemblies>

解决方案现在无法构建并出现错误：

  

错误2对象引用未设置为对象的实例。

我如何让它不失败？

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