I have been doing my master thesis in Germany for the last six months and submitted my thesis this week. I kept in touch with the supervisor while I was writing the thesis and the result was satisfactory to him.
But as I was preparing the slides for my defense today, I suddenly received an email saying that my defense will be cancelled and that a meeting is needed next week. The professor and supervisor want to talk to me regarding the thesis. I asked the reason, but the supervisor did not give a clear reply, and just said that I don't need to prepare anything.
I am pretty sure that my thesis was written and completed independently by me. I am now very anxious about this unexpected situation. How can I approach this situation and prepare for the meeting?