If you did the research on the correct topic but, in the event that you chose the comparative approach, you used incorrect (not the prescribed) comparative jurisdiction. 

If you did the research on a topic other than the prescribed topic

If your Turnitin similarity index is 80% or higher.

Any form of academic dishonesty is detected, including plagiarism (also in those with a similarity index of below 80%) and text manipulation. 

Your assessment does not have a reliable Turnitin report attached to it due to either not accepting the Eula or leaving your submission with a "report unavailable" message.