当我右键单击一个文件夹并单击“添加控制器”时，我收到此错误：
Object reference not set to an instance of an object
当我打开项目时，这个错误也开始出现在包管理器控制台中。
New-Object : Could not load file or assembly 'System.Management.Automation, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
At C:\Users\b\Desktop\Git\EyeglassShop\packages\MvcScaffolding.1.0.9\tools\registerWithMvcTooling.ps1:163 char:27
+ $newProvider = New-Object <<<< $powerShellScaffolderProviderType($mvcScaffoldingProvider)
+ CategoryInfo : NotSpecified: (:) [New-Object], FileNotFoundException
+ FullyQualifiedErrorId : System.IO.FileNotFoundException,Microsoft.PowerShell.Commands.NewObjectCommand
这是一个完全相同的问题。
无法添加 MVC 控制器 VS2012 给出“对象引用未设置为对象的实例”
解决方案是安装 PowerShell 3，但是当我运行安装程序时出现另一个错误：
The update is not applicable to your computer.
值得一提的另一件事是，此错误仅在特定项目中发生，如果我创建一个新的 MVC 项目，它可以正常工作。
如果我可以避免将所有内容都转移到新项目中，那我就不会太棒了。有什么建议么？
更新
尝试从包管理器控制台安装 MvcScaffolding 时出现错误
PM> install-package MvcScaffolding
Attempting to resolve dependency 'T4Scaffolding'.
Attempting to resolve dependency 'T4Scaffolding.Core'.
Attempting to resolve dependency 'EntityFramework'.
Successfully installed 'T4Scaffolding.Core 1.0.0'.
Successfully installed 'T4Scaffolding 1.0.8'.
Successfully installed 'MvcScaffolding 1.0.9'.
New-Object : Could not load file or assembly 'System.Management.Automation, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
At C:\Users\b\Desktop\EyeglassShop\EyeglassShop\packages\MvcScaffolding.1.0.9\tools\registerWithMvcTooling.ps1:163 char:27
+ $newProvider = New-Object <<<< $powerShellScaffolderProviderType($mvcScaffoldingProvider)
+ CategoryInfo : NotSpecified: (:) [New-Object], FileNotFoundException
+ FullyQualifiedErrorId : System.IO.FileNotFoundException,Microsoft.PowerShell.Commands.NewObjectCommand
Successfully added 'T4Scaffolding.Core 1.0.0' to EyeglassShop.
Successfully added 'T4Scaffolding 1.0.8' to EyeglassShop.
Successfully added 'MvcScaffolding 1.0.9' to EyeglassShop.