当我试图在c#中运行允许用户登录和注册帐户的后端应用程序时，出现以下错误：

Microsoft.EntityFrameworkCore.Database.Command: Error: Failed executing DbCommand (3ms) [Parameters=[], CommandType='Text', CommandTimeout='60']
    IF SERVERPROPERTY('EngineEdition') <> 5
    BEGIN
        ALTER DATABASE [master] SET SINGLE_USER WITH ROLLBACK IMMEDIATE;
    END;
    fail: Microsoft.EntityFrameworkCore.Database.Command[20102]
          Failed executing DbCommand (3ms) [Parameters=[], CommandType='Text', CommandTimeout='60']
          IF SERVERPROPERTY('EngineEdition') <> 5
          BEGIN
              ALTER DATABASE [master] SET SINGLE_USER WITH ROLLBACK IMMEDIATE;
          END;
    Exception thrown: 'Microsoft.Data.SqlClient.SqlException' in Microsoft.EntityFrameworkCore.Relational.dll
    Exception thrown: 'System.AggregateException' in System.Private.CoreLib.dll