Hello,
the issue was already mentioned in <a class="postlink" href="https://github.com/aspnetboilerplate/aspnetboilerplate/issues/1141">https://github.com/aspnetboilerplate/as ... ssues/1141</a> along with its solution. Starting the service Distributed Transaction Coordinator solved the problem.
Sorry, anyway hope this helps.
The nuget cache was corrupted. Clearing it fixed the problem.
The problem is with my development machine. I tried with another machine and all works perfectly.
sorry for bothering you. Anyway, I still don't know how to fix the problem..