我正在尝试从TeamCity构建步骤调用控制台应用程序（用c＃编写）。该应用程序从TFS文件夹中提取脚本并在数据库上执行它们。
TeamCity在尝试执行应用程序时抛出以下错误：
Starting: C:\Utilities\DatabaseUpdateAgent\DatabaseUpdateAgent\bin\Debug\DatabaseUpdateAgent.exe Main
[Step 2/2] in directory: C:\BuildAgent\work\aeaa47afdd4f1378
[Step 2/2] Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.
[Step 2/2] at Microsoft.TeamFoundation.Client.TfsTeamProjectCollectionFactory.GetTeamProjectCollection(RegisteredProjectCollection projectCollection)
[Step 2/2] at DatabaseUpdateAgent.DatabaseUpdateWorker.UpdateScripts(ConnectionStringSettings connection) in c:\Utilities\DatabaseUpdateAgent\DatabaseUpdateAgent\DatabaseUpdateWorker.cs:line 63
[Step 2/2] at DatabaseUpdateAgent.DatabaseUpdateWorker.UpdateDatabase() in c:\Utilities\DatabaseUpdateAgent\DatabaseUpdateAgent\DatabaseUpdateWorker.cs:line 50
[Step 2/2] at DatabaseUpdateAgent.Program.Main(String[] args) in c:\Utilities\DatabaseUpdateAgent\DatabaseUpdateAgent\Program.cs:line 19
[Step 2/2] Process exited with code 255
当我打开命令提示符并输入：
时C：\ Utilities \ DatabaseUpdateAgent \ DatabaseUpdateAgent \ bin \ Debug \ DatabaseUpdateAgent.exe Main
它运行没有问题。错误来自此代码：
[Line 62] var server = RegisteredTfsConnections.GetProjectCollection(new Uri("http://tfsserver:8080/tfs/DefaultCollection"));
[Line 63] var projects = TfsTeamProjectCollectionFactory.GetTeamProjectCollection(server);
[Line 64] var versionControl = (VersionControlServer)projects.GetService(typeof(VersionControlServer));
TeamCity在TFS连接代码方面做了哪些不同的事情，导致它在TeamCity执行时不运行，但如果手动执行则运行良好？