title: [error]Process 'appcmd.exe' exited with code '87'
body: <p>I am new to <code>tfs-2018</code>, I am trying to do deploy on one of my servers but getting below error in the log. I was able to deploy on other 2 systems but one system is giving the bellow error. Any help will be appreciated</p>
  
  <p>Log: </p>
  
  <blockquote>
    <p>2018-01-29T06:55:20.8002862Z ##[section]Starting: IIS Web App Manage
    2018-01-29T06:55:20.8484384Z ==============================================================================</p>
    
    <p>2018-01-29T06:55:20.8484384Z Task         : IIS Web App Manage
    2018-01-29T06:55:20.8484384Z Description  : Create or update a Website, Web App, Virtual Directories, and Application Pool
    2018-01-29T06:55:20.8484384Z Version      : 0.4.4
    2018-01-29T06:55:20.8484384Z Author       : Microsoft Corporation
    2018-01-29T06:55:20.8484384Z Help         : <a href="https://go.microsoft.com/fwlink/?linkid=839731" rel="noreferrer">More Information</a>
    2018-01-29T06:55:20.8484384Z ==============================================================================</p>
    
    <p>2018-01-29T06:55:24.2725407Z ##[command]"C:\Windows\system32\inetsrv\appcmd.exe"  list app "Default Web Site/PDM"
    2018-01-29T06:55:24.4872952Z ##[command]"C:\Windows\system32\inetsrv\appcmd.exe"  set app /app.name:"Default Web Site/PDM" -[path='/'].physicalPath:"E:\inetpub\wwwroot\PDM" -[path='/'].userName: -[path='/'].password:
    2018-01-29T06:55:24.7066288Z APP object "Default Web Site/PDM" changed
    2018-01-29T06:55:24.7066288Z ERROR ( hresult:80070057, message:Failed to commit configuration changes.<br>
    2018-01-29T06:55:24.7998202Z 
    2018-01-29T06:55:24.7998202Z The parameter is incorrect.
    2018-01-29T06:55:24.7998202Z 
    2018-01-29T06:55:24.7998202Z  )
    2018-01-29T06:55:25.1905059Z ##[error]Process 'appcmd.exe' exited with code '87'.
    2018-01-29T06:55:25.3169881Z ##[section]Finishing: IIS Web App Manage</p>
  </blockquote>
  
  <p>Below is the configuration details attached.</p>
  
  <p><a href="https://i.stack.imgur.com/8j9Yk.png" rel="noreferrer"><img src="https://i.stack.imgur.com/8j9Yk.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/OCyrc.png" rel="noreferrer"><img src="https://i.stack.imgur.com/OCyrc.png" alt="enter image description here"></a></p>