.Net Core 1.0.0 - SDK Preview 2 (x64)
.Net Core 1.0.0 - VS "15" Preview 2 (x64)
.Net Core 1.0.0 - Runtime (x64)
So,
If AddDbContext is used, then also ensure that your DbContext type accepts a DbContextOptions object in its constructor and passes it to the base constructor for DbContext.
The error message says your DbContext(LogManagerContext ) needs a constructor which accepts a DbContextOptions. But i couldn't find such a constructor in your DbContext. So adding below constructor probably solves your problem.
public LogManagerContext(DbContextOptions options) : base(options)
{
}
Edit for comment
If you don't register IHttpContextAccessor explicitly, use below code:
services.AddSingleton();